¶ 1. The State appeals the court of appeals published decision1 reversing Rory A. McKellips' conviction after a jury found McKellips guilty of using a computer to facilitate a child sex crime contrary to Wis. Stat. § 948.075(lr) (2013-14).2 The main issue in this case is whether the element, use of a "computerized communication system" in § 948.075(lr), was satisfied when McKellips *444used his flip-style cellphone to exchange texts with, and receive picture messages from, the fourteen-year-old victim.3 We also address whether Wis. Stat. § 948.075 is unconstitutionally vague, whether the jury instruction on this charge was erroneous, and if so, whether this instruction was harmless, and whether the court of appeals erred when it exercised its discretionary authority under Wis. Stat. § 752.35 to reverse McKellips1 conviction and remand for a new trial.
¶ 2. We hold the State satisfied its burden of proving the element, use of a "computerized communications system," because McKellips used his cellphone as a computer to send communications to the victim over the computer system used by their cellphones so that he could have sexual contact with her. We also hold that Wis. Stat. § 948.075 is not unconstitutionally vague because a person of ordinary intelligence would understand that using a cellphone to text or picture-message a child to entice sexual encounters violates the statute, and because the statute is capable of objective enforcement. Further, we hold that the jury instruction given here, although not perfect, when read as a whole, accurately stated the law. Even if the instruction were erroneous, it was harmless error. Finally, we hold that the court of appeals erred when it exercised its discretionary authority under Wis. Stat. § 752.35 to reverse McKellips' conviction. The real *445controversy was fully tried in this case; moreover, discretionary reversals under § 752.35 are limited to exceptional cases.
I. BACKGROUND
¶ 3. Athens High School hired 56-year-old McK-ellips to coach the varsity girls' basketball team for the 2010-11 season. The Athens team was struggling to win games and McKellips had successfully coached other teams to state championships. In addition to coaching high school basketball, McKellips worked at Wausau Paper as a coal unloader.
¶ 4. In selecting the team for the 2010-11 season, McKellips chose two talented freshman to play on the varsity team: C.H. and her friend, T.R. During the season, McKellips called C.H.'s mother's home phone to praise C.H.'s basketball talent. He also called C.H.'s cellphone to tell her how well she played and talk to her about her potential to receive a college basketball scholarship. At the end of one of these phone calls, McKellips said "I love you." C.H. told T.R. about this and realized McKellips was not having the same type of frequent contact with T.R.
¶ 5. After high school basketball season ended, C.H. continued to play basketball with an Amateur Athletic Union (AAU) tournament team. McKellips' cellphone contact with C.H. increased and expanded beyond the topic of basketball. In May 2011, C.H.'s AAU team played in a tournament in Minnesota. While in Minnesota, C.H.'s mother noticed C.H. talking on C.H.'s cellphone. When C.H. told her mother she was talking to McKellips, her mother told her to get off the phone and told C.H. that if her coach wanted to talk to C.H., he should call their home phone. C.H.'s *446father also told C.H. the same thing — that if her coach wanted to talk to her, he should call the home phone.4 When C.H. told McKellips that he had to call the home phone to talk to her, McKellips bought C.H. a Motorola flip-style TracPhone without her parents' knowledge or permission.
¶ 6. On June 10, 2011, the Athens Varsity Softball Team played in the sectional playoff game in Wausau. C.H. was on the team. McKellips attended the game and met C.H. and her family at a restaurant afterwards. McKellips snuck the cellphone to C.H. at the restaurant.
f 7. On June 11, 2011, C.H. played in an AAU basketball game, during which she tore her ACL. Her mother picked her up and arranged to take her to McKellips' home because her mother had other plans, did not want C.H. to be alone, and felt McKellips could help reassure C.H. regarding injury recovery. As McK-ellips helped C.H. into the car, he kissed C.H. on the cheek. After this, McKellips started calling her endearing names like "baby doll" and "sweetheart" and gave her gifts. Over the next several months, according to C.H., she engaged in a secret sexual relationship with McKellips.
¶ 8. On Labor Day in September 2011, the relationship ended when C.H.'s father found her secret cellphone. C.H. admitted McKellips had bought it for her. C.H. texted McKellips using a texting app on her iPod to warn him that her father had found the cellphone and to reassure McKellips that she would keep their secret. Over the next two days, C.H. told her parents about her relationship and sexual contact with *447McKellips. On September 7, 2011, C.H. told the police her accounting of what happened with McKellips. On September 9, 2011, Police Officer Matt Wehn went to talk to McKellips about what C.H. reported. When Wehn arrived at McKellips' workplace, Wehn asked for McKellips' cellphone. McKellips told Wehn that he had just dropped the cellphone in a coal pit but would try to recover it later that day. McKellips later admitted, however, that he lied about losing his cellphone, had hid the cellphone, and did not want to turn it over to police. Wehn took McKellips into the police station for questioning. McKellips denied having any sexual contact with C.H.
¶ 9. Police searched McKellips' workplace to look for his cellphone in the coal pit, but no phone was found. Three days later, McKellips returned to his workplace to retrieve his phone from where he hid it. In May 2012, he gave his phone to his attorney who turned it over to police. The police investigation showed that between December 18, 2010 and July 27, 2011, there were 8,324 total contacts between McKel-lips' cellphone and C.H.'s regular cellphone (4,816 texts from C.H. to McKellips and 3,184 texts from McKellips to C.H.). Between June 10, 2011 and July 27, 2011, records show 2,426 total contacts between McKellips' cellphone and C.H.'s secret cellphone. McK-ellips' cellphone, when received by police, however, had no content on it from November 16, 2010 through July 28, 2011. Text messages between McKellips and C.H. on July 29-30, 2011 were recovered. These included an exchange of "love you" and McKellips' text to C.H., "Morning beautiful day yesterday." Police also recovered C.H.'s and McKellips' contacts on C.H.'s iPod from the day the secret cellphone was discovered.
*448f 10. The State charged McKellips with repeated sexual assault of a child, exposing genitals or pubic area, use of a computer to facilitate a child sex crime, and resisting or obstructing an officer. McKellips pleaded not guilty and the case was tried to a jury.
¶ 11. The State called 16 witnesses. C.H. testified first. She described how her relationship with McKellips developed. It started when he selected her to play for the varsity high school basketball team. Calls and texts from McKellips during that season generally focused on basketball. There was only one unusual call where he ended by saying "I love you." When the season ended, the contacts with McKellips increased, and both of her parents told her this cellphone contact needed to stop. While in Minnesota for an AAU tournament, her mother got upset with her for talking to McKellips and told her he was her coach and could call the home phone. When C.H. told McKellips that, he said he would buy C.H. a cellphone so they could continue the contacts without her parents' knowledge. McKellips slipped her the newly-purchased cellphone when they met after a softball game. It was a Motorola flip-style TracFone that she activated and to which she added minutes so she could secretly communicate with McKellips. After C.H. tore her ACL, she convinced her mother to let her spend time with McKellips and his wife who were going to a grandson's baseball game. C.H. testified that this is when the first physical contact occurred: as McKel-lips helped her to the car and with his wife not around, McKellips kissed her on the cheek. After this incident, their cellphone contacts increased and McKellips started using relationship terms when talking to her such as "baby doll" and "sweetheart." He told her he loved her.
*449¶ 12. C.H. described four incidents of sexual contact:
(1) June 2011. McKellips picked her up and took her to his house where they were going to make pies with his wife. McKellips' wife was not home and the pies were already made. C.H. testified that they sat on the couch in the living room where they kissed on the lips, he touched her under her clothes, and he pulled down his pants to expose his erect penis. He put his hands on her head and brought her mouth to his penis and fluids came out of his penis. C.H. said this was her first sexual experience ever. She also explained that he touched the area where she had pubic hair and put his mouth on the area where she urinates. Afterwards, he drove her home and told her she could not tell anyone. After this incident, their cellphone contact increased to more than once a day.
(2) July 2011. McKellips stopped by her mother's home where C.H. was babysitting her one-year-old brother who was asleep. McKellips kissed her on the lips and slipped his hands into her pants touching her buttocks but on top of her underwear. McKellips also took her hand and placed it over his pants on his erect penis.
(3) July 29, 2011. McKellips picked C.H. up and took her to his house to help prepare for a fish fry he was hosting. He said his sister would be there helping but when they arrived at McKel-lips' home, his sister was not there. C.H. and McKellips were home alone and they sat on the living room couch kissing. McKellips touched her breasts under her shirt but over her bra, *450touched her vaginal area with his hands and mouth, and put her mouth on his erect penis until fluids came out.
(4) August 2011. C.H.'s family was visiting her grandmother who lived near McKellips' house. C.H. convinced her mother to let her walk to his home where again C.H. and McKellips were alone. They sat on the living room couch kissing and another incident of oral sex occurred.
¶ 13. C.H. testified that in June and July of 2011, at McKellips' request, she sent him seven to ten picture messages of her, three of which were of her in her bra and underwear. After she sent the pictures, McKellips would tell her he liked them. She also described what happened when her father found the secret cellphone on September 5, 2011:
• She contacted McKellips to warn him that her father found the secret cellphone;
• She sent McKellips texts from her iPod: "I just told them the truth. Tht we hugged and a kiss on the cheek nothing physical. And idk what's going to happen bu[t] my parents said their not going to tell anyone just probably talk to u." And, "Tht I was all just txtin and we never did anything just txting and talk not actually doing anything."
• On September 6, 2011, at school, she borrowed her cousin A.B.'s cellphone to call McKellips and reassured him that she did not disclose the sexual nature of their relationship to her parents.
*451• That evening, she met with her mother, father, stepmother, and stepfather and disclosed everything that had happened between her and McK-ellips.
• On September 7, 2011, she reported this information to the police and gave them her secret cellphone and her iPod.
¶ 14. Other witnesses confirmed the details of C.H.'s testimony. A.B. testified that C.H. borrowed A.B.'s cellphone at school on September 6, 2011, called McKellips, and talked for 2.5 minutes. T.R., the other freshman selected for the 2010-11 varsity basketball team, testified that she did not receive frequent phone calls from McKellips and the ten to fifteen calls she did receive during the basketball season all pertained to basketball. Both girls testified they know C.H. to be a truthful person.
¶ 15. Guy Otte, the activities director at Mosinee High School, where McKellips previously coached varsity girls basketball, testified that he met with McK-ellips two times during McKellips' years at Mosinee to discuss the importance of maintaining proper boundaries with players and stressed that coaches should not give gifts to student athletes. Brad Tipple, C.H.'s AAU coach, also testified. He talked about how talented and hard-working C.H. was as a player. He saw no evidence that C.H. was depressed. As a coach, he does not have much contact with players outside of practice and games.
¶ 16. Danielle Diedrich, a teacher at Athens High School, testified that she coached the junior varsity girls basketball team and assisted McKellips with the varsity team during the 2010-11 season. She told the jury C.H. was a great athlete who worked hard *452100 percent of the time and did not have any mental health problems. She thought it was odd that McKel-lips kept calling C.H. at the AAU Minnesota tournament when he knew that Diedrich, his assistant coach, was at the same tournament. She also testified that she ran into McKellips at the Best Buy in Wausau when he bought what turned out to be the secret cellphone for C.H.
¶ 17. C.H.'s father T.H., her mother J.B., and C.H.'s stepfather testified next. T.H. testified:
• He caught C.H. talking to McKellips and warned her to stop as it could lead to problems.
• He found the secret cellphone, questioned his daughter and explained how upset she was— initially only admitting that McKellips had hugged her, kissed her on the cheek, and had exchanged text messages with her.
• C.H. eventually disclosed everything that happened and was very upset and did not want her parents and stepparents to tell anyone or call the police.
• C.H. was generally a truthful person.
¶ 18. J.B. testified:
• McKellips would call her home phone during the basketball season to talk about basketball games or how C.H. played.
• He gave the family gifts including Packers' jerseys for the whole family, a Buddha doll, and vegetables or fish.
• She was upset when she learned McKellips was talking to C.H. on her cellphone after school basketball season ended and told C.H. to tell him to use the home phone.
*453• She thought McKellips acted oddly when he met them at a restaurant in Wausau after C.H.'s sectional softball game.
• She confirmed that C.H. went to McKellips' home in June 2011 to make pies, that C.H. went to McKellips' home on July 29, 2011 to help prepare fish, and again in August when they were at the grandmother's house near where McKellips lived.
• On the day the secret cellphone was discovered, J.B.'s phone records showed that McKellips called her multiple times and when she finally talked to him that day, J.B. did not disclose to McKellips that the secret cellphone had been found; McKellips told J.B. he was trying to reach her because he had an extra ticket for a Brewers game.
• C.H. is generally a truthful person and although she was sad about hurting her knee, she was not depressed.
¶ 19. C.H.'s stepfather testified about how much C.H. loved basketball, what happened when the secret cellphone was discovered, and how difficult it was to hear C.H. disclose what happened with McKellips. He also described McKellips' unusual behavior at the Wausau restaurant.
¶ 20. Steve Cotey and Robert Fochs both worked as supervisors at Wausau Paper. Cotey testified that on September 9, 2011, the front office called and said the police were there asking to speak with McKellips. When Cotey told McKellips a police officer was asking to speak with McKellips, McKellips did not seem surprised. Fochs told the jury about the Mosinee Chief of Police Kenneth Muelling asking for his help to search for McKellips' cellphone, which McKellips *454claimed he dropped in a coal pit. After searching McKellips' work area, personal locker and truck, no phone was located. Muelling's testimony confirmed the search with Fochs.
¶ 21. Theresa Steiber testified that she was friends with McKellips' 33-year-old daughter, B.B., and that McKellips coached their basketball team in 7th and 8th grade as well as high school. Steiber told the jury that as a 7th and 8th grader, McKellips made her feel uncomfortable because he expressed his love for her in letters, gave her jewelry and a Bulls jacket, held her hand, rubbed her leg, and gave her back rubs. McKellips would say things to her like "if only he was 30 years younger," and she tried to avoid him because of this conduct. Steiber testified that McKellips' behavior stopped when she started high school.
¶ 22. Ryan Kaiser testified for the State as a cellphone expert witness. He told the jury:
• The Mosinee police asked him to examine the flip-style cellphone involved in this case.
• This type of phone had logical functions including "computing the data you are typing into it" and that it had predictive texting, which puts the words on the screen before the user is done typing them.
• This phone had memory, took and saved pictures and videos, and had some internet capabilities.
• There are internal impulses in the phone that made the device function; when the user pushed buttons, information was sent through the device creating images on the screen.
*455• All cellphone carriers are connected to a server and use a computer system or computer network especially when sending text messages.
¶ 23. The State's last two witnesses were Athens Chief of Police Aaron Stencil and City of Mosinee Police Officer Matt Wehn. Stencil testified about taking C.H.'s statement on September 7, 2011 and described how C.H. was crying and upset. Wehn testified that:
• He gathered all the cellphone records in this case and created an exhibit documenting the phone numbers and contacts between the various phones.
• Between December 18, 2010 and July 27, 2011, there were 8,324 contacts between McK-ellips' cellphone and C.H.'s regular cellphone. McKellips received 4,816 text messages and sent 3,184.
• Between June 10, 2011 and July 27, 2011, there were 2,426 total contacts between McKellips' cellphone and C.H.'s secret cellphone.
• McKellips activated a new cellphone on July 30, 2011 and the first phone call he made was to C.H.'s secret cellphone. Using the new phone, between July 30, 2011 and September 5, 2011, McKellips sent 77 texts to C.H.'s secret cellphone and received 191 texts. McKellips' phone used 4,224 minutes during that time.
• McKellips' cellphone received ten multimedia messages from C.H.'s secret cellphone. Multimedia messages "would be anything from video to pictures to a voice file, an electronic file, as opposed to just the written word."
*456¶ 24. Wehn also told the jury that as a part of his investigation, on September 9, 2011, he went to Wau-sau Paper to talk to McKellips. When he arrived, McKellips told him he had dropped his cellphone in the coal pit. Wehn learned McKellips had not really dropped his cellphone in the coal pit, but hid it because he did not want to turn it over to police. Wehn took McKellips into the police station for questioning. The audio recordings of McKellips' statements were played for the jury.
¶ 25. In May 2012, Wehn collected McKellips' cellphone from his attorney and it was in good condition, but there were no messages from or to C.H. on the cellphone. Wehn also testified about the last contacts on C.H.'s regular cellphone to McKellips' cellphone the night of September 5, 2011: one text at 7:01 p.m. and two incoming calls from McKellips, one of which was answered at 7:05 p.m.
f 26. The defense called four witnesses. McKel-lips' daughter B.B. testified that she does not remember her father acting inappropriately toward her friend, Theresa Steiber, and that she bought the Bulls jacket for Steiber. C.S., McKellips' sister, testified that on the fish-fry night, McKellips and C.H. were never alone in the house or his truck. Connie McKellips, McKellips' wife, testified that they treated C.H. like their own daughter, C.H. liked spending time with them because her parents were fighting, they helped C.H. with her depression, and C.H. was never alone in their home with McKellips. The last defense witness was McKellips. He testified:
• He never had any sexual contact with C.H. and they were never alone inside his home.
*457• He did give C.H. a hug and kiss on the cheek after she was injured.
• He regularly called his players "baby doll" and said "I love you" to all of them.
• He bought the secret cellphone for C.H. to help her because she was depressed and suicidal; C.H. asked for the phone.
• He never downloaded any pictures from C.H. as he did not know how to do so.
• He admitted lying to the police about dropping his cellphone in the coal pit; he lied because he believed C.H.'s iPod text on his cellphone would help him and he did not want it to get erased.
• He never touched C.H. at her mother's house.
• He talked to C.H. a lot because she was "needy."
• He admitted C.H.'s parents did not know about the secret cellphone.
¶ 27. After closing arguments, the trial court instructed the jury. It gave the standard jury instruction on "use of a computer to facilitate a child sex crime," as well as a supplemental instruction and definition of computer:
The third count of the information charges that the defendant, Rory McKellips, on or about May 1st, 2011, to August 31st of 2011, in the City of Mosinee, Marathon County, Wisconsin, did use a computerized communication system to communicate with an individual who the actor believed, or had reason to believe, had not attained the age of 16 years, with intent to have sexual contact with the individual, or sexual intercourse with the individual.
To this charge, the defendant has also entered a plea [of] not guilty, which means the state must prove every element of the offense charged beyond a reasonable doubt.
*458Section 948.075 is violated by a person who uses a computerized communication system to communicate with an individual who the person believes, or has reason to believe, has not attained the age of 16 years with intent to have sexual contact or sexual intercourse with the individual. Before you may find the defendant guilty of this offense, the state must prove by evidence which satisfies you beyond a reasonable doubt that the following [four] elements were present.
Number one. That the defendant used a computerized communication system to communicate with an individual.
Number two. That the defendant believed or had reason to believe that the individual was under the age of 16 years.
Number three. That the defendant used a computerized communication system to communicate with the individual with intent to have sexual contact with the individual.
Number four. That the defendant did an act in addition to using a computerized communication system to carry out the intent to have sexual contact.
[Evidence has been received that the defendant communicated with a child under the age of 16 via a mobile or cellphone. You must determine whether the phone described in the evidence constitutes a computerized communication system.
To aid you in that determination, you are instructed that under Wisconsin law, a computer is defined as • — • computer is defined as computer, which means an electronic device that performs logical, arithmetic, and memory functions by manipulating electronic or magnetic impulses, and includes all input, output, processing, storage, computer software and communication facilities that are connected or related to a computer in a computer system or corn-*459puter network. Computer system is defined as a set of related computer equipment, hardware, or software.]
Sexual contact is an intentional touching of an intimate part of C.QH. by the defendant. The touching may be of an intimate part directly, or it may be through the clothing. The touching may be done by any body part or by any object, but it must be an intentional touching. Sexual contact also requires that the defendant acted with intent to become sexually aroused or gratified.
You cannot look into a person's mind to find intent and belief. Intent and belief must be found, if found at all, from the defendant's acts, words, and statements, if any, and from all the facts and circumstances in this case bearing upon intent and belief.
If you are so satisfied beyond a reasonable doubt that all [four] elements of this offense have been proven, you should find the defendant guilty. If you are not so satisfied, you must find the defendant not guilty.
Wis JI — Criminal 2135 (Apr. 2013)(emphases added; third set of brackets contains supplemental instruction).
¶ 28. The jury convicted McKellips on the Wis. Stat. § 948.075 charge and obstruction, but acquitted him of the other two charges. He was sentenced to 15 years, consisting of ten years of initial confinement followed by five years of extended supervision on the computer charge and nine months concurrent on the obstruction charge. McKellips appealed the conviction to the court of appeals, arguing (1) he did not violate Wis. Stat. § 948.075 because his cellphone did not use the internet; (2) § 948.075 is unconstitutional; and (3) the circuit court erroneously exercised its discretion when it admitted other acts evidence. The court of appeals did not decide these issues. Instead, it sua *460sponte held that the jury instruction on § 948.075 "misdirected" the jury by asking it to determine whether the cellphone itself constituted the computerized communication system instead of asking the jury "whether McKellips' various alleged uses of the cell phone constituted communication via a computerized communication system." State v. McKellips, 2015 WI App 31, ¶ 22, 361 Wis. 2d 773, 864 N.W.2d 106. The court of appeals exercised its discretionary authority under Wis. Stat. § 752.35, reversed McKellips' conviction, and ordered a new trial in the interest of justice because "the real controversy was not tried." Id. The State petitioned this court for review, which we granted.
II. STANDARD OF REVIEW
f 29. This case involves the interpretation and application of Wis. Stat. § 948.075, which is a question of law that we review independently. See Shannon E.T. v. Alicia M. V.M., 2007 WI 29, ¶ 31, 299 Wis. 2d 601, 728 N.W.2d 636. Our standards for interpreting statutes are well-known and need not be repeated here. See State ex rel. Kalal v. Circuit Court for Dane Cty., 2004 WI 58, ¶¶ 44-52, 271 Wis. 2d 633, 681 N.W.2d 110. This case also involves a constitutional challenge to § 948.075, which likewise presents a question of law requiring our independent review. See Aicher v. Wis. Patients Comp. Fund, 2000 WI 98, ¶ 18, 237 Wis. 2d 99, 613 N.W.2d 849. "Statutes are presumptively constitutional. The court indulges every presumption to sustain the law if at all possible, and if any doubt exists about a statute's constitutionality, we must resolve that doubt in favor of constitutionality." Id., ¶ 18 (internal citation omitted).
*461f 30. In addition, this case involves our review of the jury instruction on the Wis. Stat. § 948.075 charge. Although a circuit court has broad discretion when instructing a jury, we review independently whether the instructions given accurately stated the law. See State v. Beamon, 2013 WI 47, ¶ 18, 347 Wis. 2d 559, 830 N.W.2d 681. If the jury instructions did not accurately state the law, then the circuit court erroneously exercised its discretion. State v. Ferguson, 2009 WI 50, ¶ 9, 317 Wis. 2d 586, 767 N.W.2d 187. We, however, do not review a particular instruction in isolation; instead, we analyze the instructions as a whole to determine their accuracy, viewing them in the context of the overall charge. See State v. Pettit, 171 Wis. 2d 627, 637, 492 N.W.2d 633 (Ct. App. 1992). Finally, we review the court of appeals' exercise of its discretionary authority under Wis. Stat. § 752.35, which requires us to determine whether the court of appeals erroneously exercised its discretion in granting McKellips a new trial in the interest of justice. See State v. Johnson, 149 Wis. 2d 418, 428-29, 439 N.W.2d 122 (1989), confirmed on reconsideration, 153 Wis. 2d 121, 449 N.W.2d 845 (1990). "Reversals in the interest of justice should be granted only in exceptional cases." State v. Kucharski, 2015 WI 64, ¶ 23, 363 Wis. 2d 658, 866 N.W.2d 697 (emphasis added).
III. ANALYSIS
A. Application of computerized communication system
f 31. The main dispute is whether an exchange of texts and picture messages between flip-style cell*462phones constitutes use of a "computerized communication system" in Wis. Stat. § 948.075(lr). The State argues that such exchanges satisfy that term. McKel-lips disagrees, and asserts that the term is only satisfied when the internet is involved. We agree with the State.
¶ 32. Wisconsin Stat. § 948.075, entitled, "[u]se of a computer to facilitate a child sex crime," provides:
(lr) Whoever uses a computerized communication system to communicate with an individual who the actor believes or has reason to believe has not attained the age of 16 years with intent to have sexual contact or sexual intercourse with the individual in violation of s. 948.02 (1) or (2) is guilty of a Class C felony.
(2) This section does not apply if, at the time of the communication, the actor reasonably believed that the age of the person to whom the communication was sent was no more than 24 months less than the age of the actor.
(3) Proof that the actor did an act, other than use a computerized communication system to communicate with the individual, to effect the actor's intent under sub. (lr) shall be necessary to prove that intent.
"Computerized communication system" is not defined in this statute, but under statutory interpretation rules, we may apply the ordinary and accepted meaning of this term unless it has a technical or special definition. See State ex rel. Kalal, 271 Wis. 2d 633, ¶ 45. In doing so, we may use a dictionary to establish the common meaning of an undefined statutory term. State v. Sample, 215 Wis. 2d 487, 499-500, 573 N.W.2d 187 (1998). The court of appeals concluded "computerized communication system" must be a "legislative *463term of art" because it was "unable to locate a definition for the term in any dictionaries or internet searches." McKellips, 361 Wis. 2d 773, ¶ 12. We are not convinced "computerized communication system" is a special or technical term. Rather, it is three commonly understood words used together. Although our dictionary does not specifically define the term "computerized communication system," it does define "computerized," "communication," and "system." Thus, we can examine the dictionary definitions of each of these three common words to ascertain their meaning when used together.
¶ 33. "Computerized" is defined as: "[o]f or relating to a computer or the use of a computer." Computerized, The American Heritage Dictionary of the English Language 380 (5th ed. 2011). "Communication" is defined as: "[t]he act of communicating; transmission" "[t]he exchange of thoughts, messages, or information, as by speech, signals, writing, or behavior." Communication, The American Heritage Dictionary of the English Language 373 (5th ed. 2011). "System" is defined as: "A group of interacting, interrelated, or interdependent elements forming a complex whole." System, The American Heritage Dictionary of the English Language 1768 (5th ed. 2011).
¶ 34. Putting the three definitions together gives us the meaning of "computerized communication system": A group of interacting, interrelated, or interdependent elements forming a complex whole used to exchange thoughts or messages through a computer. Using this definition, we turn to whether McKellips' use of his flip-style phone to exchange texts with C.H.'s *464cellphone satisfies the use of a "computerized communication system" element of Wis. Stat. § 948.075(lr).5
¶ 35. There is no doubt that modern cellphones today are in fact computers. See United States v. Flores-Lopez, 670 F.3d 803, 804-05 (7th Cir. 2012)("a modern cell phone is a computer"). This is true because modern cellphones contain technology enabling them to perform functions that a traditional computer does, including accessing the internet, sending and receiving email, using social media, word processing, gaming, storing pictures, and connecting to a printer. McKellips does not contest this point. Rather, he contends that *465the flip-style cellphone involved here is not computerized because the text messages did not use the internet.
¶ 36. Although the flip-style cellphone involved here may not be as advanced as some modern cellphones, McKellips' use of it satisfied the definition of computerized. The State's cellphone expert, Ryan Kaiser, provided uncontroverted testimony that the flip-style cellphone met the definition of computer. He also testified that the cellphone had logical functions including "computing the data you are typing into it" and when you pushed buttons, information was sent through the device creating images on the screen. These functions satisfy the definition of "computerized." After all, this is one of the basic functions of a computer: pushing buttons on a keypad or keyboard that sends messages through the processor, which results in numbers, letters, and words appearing on a screen. Additionally, Kaiser testified that all cellphone carriers are connected to a server and use a computer system or network, particularly when sending text messages. Thus, the first part of "computerized communication system" is met.
¶ 37. The middle word in this term, communication, does not appear to be disputed. Certainly texts and picture messages constitute communication. Both involve an exchange of messages by writing or image to another person. McKellips admits that he communicated with C.H. via text messages. Although he denied asking for or downloading the picture messages C.H. sent, there is evidence in the record documenting such activity. In any event, McKellips admits exchanging texts with C.H.
¶ 38. The final word in the term, system, was also met because the cellphones used a system to *466complete the communication. Again, Kaiser explained that all cellphone carriers are connected to a server and use a computer system or computer network, especially when sending text messages. We conclude that McKellips' texts using his flip-style cellphone satisfied the use of a "computerized communication system" element of Wis. Stat. § 948.075(lr). McKellips used his cellphone as a computer to send communications to the victim over the computer system used by their cellphones so that he could have sexual contact with her. Although case law on this issue is still developing, at least one appellate court has reached the same conclusion. See People v. Holmes, 956 N.Y.S.2d 365, 367 (N.Y. App. Div. 2012)(sending telephone text messages is not simply the use of a telephone, "but rather a telephone [that is] inextricably linked to a sophisticated computerized communication system").
¶ 39. We reject McKellips' position that this statute requires use of the internet for conduct to satisfy "computerized communication system." Although using the internet to communicate with a person who the actor believes or has reason to believe is not 16 years old with the intent of having sexual contact or intercourse certainly violates this statute,6 neither the statute, nor the definition of computerized communication system requires the use of the internet. If the legislature had intended to limit this statute to conduct involving the internet, it certainly could have done so. See Heritage Farms, Inc. v. Markel Ins. Co., 2009 WI 27, ¶¶ 14-15, 316 Wis. 2d 47, 762 N.W.2d 652 (where *467the legislature does not limit the application of a statute, we will not insert words into a statute to create such a result). By not specifically limiting this statute to internet uses, the legislature left open for prosecution the use of all computerized communication systems, including, as we have seen here, texts between cellphones.
B. Constitutionality of Wis. Stat. § 948.075
¶ 40. McKellips next argues that Wis. Stat. § 948.075 is unconstitutionally vague. His argument is not well-developed and is unconvincing.
¶ 41. A statute is unconstitutionally vague if it fails to give fair notice to a person of ordinary intelligence regarding what it prohibits and if it fails to provide an objective standard for enforcement. See State v. Pittman, 174 Wis. 2d 255, 276, 496 N.W.2d 74 (1993). The law does not require " 'the line between lawful and unlawful conduct be drawn with absolute clarity and precision.'" State v. Colton M., 2015 WI App 94, ¶ 7, 366 Wis. 2d 119, 875 N.W.2d 642 (citation omitted). "[A] statute need not be so specific as to delineate each and every mode of conduct embraced by its terms [.]" State v. Killory, 73 Wis. 2d 400, 405-06, 243 N.W.2d 475 (1976). " 'A fair degree of definiteness is all that is required.'" Colton M., 366 Wis. 2d 119, ¶ 7 (citation omitted). We presume statutes are constitutional, look for reasons to uphold the constitutionality of a statute, and place the burden on the defendant to prove beyond a reasonable doubt that a statute is unconstitutional. See Aicher, 237 Wis. 2d 99, ¶¶ 18-19.
¶ 42. McKellips has not satisfied this burden. "Computerized communication system" is sufficiently *468definite in meaning based on each word's common usage and ordinary understanding to satisfy fair notice requirements. See Killory, 73 Wis. 2d at 407. A person of ordinary intelligence need not guess at what this term means, but instead needs to simply consider the common meaning of each word in the term. Such consideration provides fair notice that using a cellphone to text a child in order to entice a sexual relationship violates the statute. McKellips' argument that the term does not give fair notice because he really did not have the intent required by the statute is not a constitutional argument, but a sufficiency of the evidence argument — an argument that was rejected by a jury that listened to all the testimony and considered all the evidence.
¶ 43. McKellips also argues that the statute is so vague it could result in prosecutions of innocent people who are using cellphones in everyday life and extend beyond the use of cellphones entirely to encompass mailing letters through the post office. McKellips' argument is meritless. The statute clearly does not criminalize ordinary use of a cellphone. In addition to the use of a computerized communication system discussed in this opinion, conviction under Wis. Stat. § 948.075 also requires proof of the actor's "intent to have sexual contact or sexual intercourse" and "[pjroof that the actor did an act, other than use a computerized communication system to communicate with the individual, to effect the actor's intent under sub. (lr)... to prove that intent." See § 948.075(lr), (3). It is absurd to suggest that a person of ordinary intelligence would not read the language of § 948.075 as fair notice that using a cellphone to send text messages to lure a child into sexual activity is against the law.
¶ 44. Our legislature, for good reason, has taken a strong stance in favor of protecting children from sex *469crimes. See Wis. Stat. ch. 948 (Crimes against children). "The state has the right to enact reasonable legislation to protect the safety and well-being of minors." Killory, 73 Wis. 2d at 407. Mindful of the need to protect children in a world of exponential technological advancement, the legislature chose an expansive term— "computerized communication system" — to protect children from falling prey to criminals taking advantage of rapidly changing technology before new laws can be passed. The legislature employed a term that would provide fair notice, but also encompasses future technologies. It selected "computerized communication system," which as explained here, is readily understandable by a person of ordinary intelligence. Because this term satisfies the fair notice aspect of the test it does not render Wis. Stat. § 948.075 unconstitutionally vague on that basis.
¶ 45. McKellips also fails to convince us that the statute does not provide an objective standard of enforcement. The standard of enforcement within the plain language of the statute clearly states the elements required to prove the crime. McKellips makes much ado about the term "computerized communication system" not being capable of objective enforcement because it is not defined. The absence of a definition does not make the statute incapable of objective enforcement. As already explained, the term "computerized communication system" is readily understandable. A search of our case law revealed ten other cases (besides McKellips') involving "computerized communication system" — none of which had any problems understanding or applying that term. See, e.g. State v. Olson, 2008 WI App 171, ¶ 1, 314 Wis. 2d 630, 762 N.W.2d 393; State v. Schulpius, 2006 WI App 263, ¶ 2, 298 Wis. 2d 155, 726 N.W.2d 706. The court *470of appeals' opinion in this case appears to stand alone as the only court that struggled with this terminology, likely because this case involved text messages between flip-style cellphones rather than the internet or email. As we have explained, the text messages satisfied the element "use[ oí] a computerized communication system." This terminology provides a clear and objective standard for enforcement. Anyone who (1) uses a computerized communication system for purposes of text messaging between cellphones to communicate with "an individual who the actor believes or has reason to believe" is not yet 16 years old and "with intent to have sexual contact or sexual intercourse" and (2) commits "an act, other than use of a computerized communication system ... to effect the actor's intent," can be prosecuted under this statute. McKellips has not proven beyond a reasonable doubt that Wis. Stat. § 948.075 is unconstitutionally vague. We reject his constitutional challenge.
C. Jury Instruction
¶ 46. McKellips next argues the jury instruction on Wis. Stat. § 948.075(lr), which asked the jury to determine whether his cellphone itself was a computerized communication system was misleading and not harmless. We do not agree.
¶ 47. The State points out that McKellips did not object to these instructions at trial or in his appeal to the court of appeals. Rather, the jury instruction issue was raised sua sponte by the court of appeals. Failure to contemporaneously object to jury instructions results in forfeiting review of the jury instructions. State v. Cockrell, 2007 WI App 217, ¶ 36, 306 Wis. 2d 52, 741 *471N.W.2d 267. Wisconsin Stat. § 805.13(3) governs jury instructions and requires contemporaneous objections be made in the circuit court. The purpose of the rule is to give the opposing party and the circuit court an opportunity to correct any error. Cockrell, 306 Wis. 2d 52, ¶ 36. This also helps preserve jury verdicts and conserve judicial resources. Despite McKellips' forfeiture, however, we choose to address this because the court of appeals based its entire reversal decision on the jury instruction, which prompted us to ask for briefing on the issue. See McKellips, 361 Wis. 2d 773, ¶¶ 20-21; see also D.L. Anderson's Lakeside Leisure Co., Inc. v. Anderson, 2008 WI 126, ¶ 41, 314 Wis. 2d 560, 757 N.W.2d 803 (we may address a forfeited issue at our discretion when we deem it important).
¶ 48. McKellips concedes that Wis. JI — Criminal 2135 is an accurate statement of the law7 but objects to the extra instructions the circuit court tacked on to the end of Wis JI-Criminal 2135 telling the jury it "must determine whether the phone described in the evidence constitutes a computerized communication system" and then instructing it on the definition of computer.
*472¶ 49. We agree with McKellips that the circuit court's instruction advising the jury it must determine whether the phone itself constituted a computerized communication system could have been more precisely worded. The jury could have been instructed to find whether the phone is a computerized device that was used to communicate through a computerized cellphone network or system to entice the sexual contact with C.H. We do not agree, however, that the circuit court's phrasing rendered the jury instructions as a whole erroneous. As noted, the circuit court correctly stated the four elements of the crime and informed the jury it must find each element beyond a reasonable doubt. This included instructing the jury repeatedly it must find that McKellips "used" a computerized communication system. See supra ¶ 27. In addition, the definition of computer given in the instruction was an accurate statement of the law and undoubtedly led the jury to conclude the cellphone was the computer McK-ellips used to communicate through the system. The jury's finding that McKellips used his cellphone to communicate with C.H. necessarily means that his cellphone was used to access the system. Obviously, his cellphone was not the system itself — rather, the cellphone and the system were connected together because the communications from his cellphone to C.H.'s cellphone could not have occurred without the use of the system. Under these circumstances, we are not convinced that this isolated wording in the extra instruction rendered the jury instructions as a whole inaccurate.
¶ 50. Because the jury instructions accurately stated the law, they were not erroneous. Even if this court were to conclude the extra instruction were erroneous, reversal is not warranted because the extra *473instruction was not prejudicial. "An error is prejudicial if it probably [and not merely possibly] misled the jury." Kochanski v. Speedway SuperAmerica, LLC, 2014 WI 72, ¶ 11, 356 Wis. 2d 1, 850 N.W.2d 160 (citation omitted). Jury instruction error is harmless when it did not contribute to the verdict. See State v. Harvey, 2002 WI 93, ¶ 48, 254 Wis. 2d 442, 647 N.W.2d 189. Any error here did not probably mislead the jury and the verdict would not have changed if the extra instruction had been re-worded. The elements of the crime were clearly stated and the evidence in the record sufficiently supported each element. Cellphone expert Kaiser's testimony was uncontroverted that the cellphone was a computer and that the exchange of text messages used a computerized system to complete the communication. Thus, the circuit court's phrasing in the extra instruction, if erroneous at all, was harmless error.
D. Wisconsin Stat. § 752.35
¶ 51. The last issue we address is whether the court of appeals erred in exercising its discretionary reversal authority under Wis. Stat. § 752.35, when it determined the interest of justice required a new trial on the ground that the real controversy was not fully tried. We have already concluded that the wording used in the extra jury instruction did not result in reversible error. Because this was the sole basis for the court of appeals' discretionary reversal, we must conclude it erred. The real controversy in this case with respect to Wis. Stat. § 948.075(lr) was whether McK-ellips used a computerized communication system with the intent to have sexual contact with C.H. As *474seen from the detailed facts set forth in part I., that issue was fully tried and thus, justice requires that the jury verdict stand.
¶ 52. We make one final point with respect to Wis. Stat. § 752.35. We have consistently held that the discretionary reversal statute should be used only in exceptional cases. See Kucharski, 363 Wis. 2d 658, ¶¶ 23, 41; State v. Avery, 2013 WI 13, ¶ 38, 345 Wis. 2d 407, 826 N.W.2d 60; Vollmer v. Luety, 156 Wis. 2d 1, 11, 456 N.W.2d 797 (1990). In Kucharski, we emphasized that it is error to jump to § 752.35 as a shortcut. "In an exceptional case, after all other claims are weighed and determined to be unsuccessful, a reviewing court may determine that reversal is nevertheless appropriate under Wis. Stat. § 752.35." Kucharski, 363 Wis. 2d 658, ¶ 43 (emphasis added). In exercising discretionary reversal, the court of appeals must engage in "an analysis setting forth the reasons" that the case may be characterized as exceptional. Id., ¶ 42. Here, the court of appeals did not decide the issues McKellips raised, and took a shortcut directly to § 752.35. McKellips did not ask the court of appeals to reverse on the basis of § 752.35. Moreover, the court of appeals exercised discretionary reversal authority without even analyzing the exceptional standard. For these reasons, we conclude the court of appeals erred in reversing McKellips' conviction and ordering a new trial under § 752.35.
IV. CONCLUSION
¶ 53. We hold the State satisfied its burden of proving the element, use of a "computerized communications system," because McKellips used his cellphone *475as a computer to send communications to the victim over the computer system used by their cellphones so that he could have sexual contact with her. We also hold that Wis. Stat. § 948.075 is not unconstitutionally vague because a person of ordinary intelligence would understand that using a cellphone to text or picture message with a child to entice sexual encounters violates the statute; moreover, the statute is capable of objective enforcement. Further, we hold that the jury instruction given here, although not perfect, when read as a whole accurately stated the law. Even if the extra instruction were erroneous, it was harmless error. Finally, we hold that the court of appeals erred when it exercised its discretionary authority under Wis. Stat. § 752.35 to reverse McKellips' conviction. The real controversy was tried in this case; moreover, discretionary reversals under § 752.35 are limited to exceptional cases, and the court of appeals failed to analyze that criterion before reversing under § 752.35.
By the Court. — The decision of the court of appeals is reversed.8
¶ 54. DAVID T. PROSSER, J., did not participate.See State v. McKellips, 2015 WI App 31, 361 Wis. 2d 773, 864 N.W.2d 106.
The jury also convicted McKellips of restricting or obstructing an officer, contrary to Wis. Stat. § 946.41(1), but McKellips did not challenge that conviction in the court of appeals and does not do so here. In addition, the jury acquitted McKellips of repeated sexual assault of a child and exposing genitals or pubic area, contrary to Wis. Stat. §§ 948.025(l)(e), *444939.50(3)(c), 948.10(1) and 939.50(3)0). The Honorable Michael K. Moran presided in the circuit court.
All subsequent references to the Wisconsin Statutes are to the 2013-14 version unless otherwise indicated.
The communications started when the victim was fourteen years old but continued after she turned fifteen years old.
C.H.'s parents were divorced and remarried. C.H. split time equally between her mother's and father's homes.
The court of appeals, in attempting to define "computerized communication system" discusses Wis. Stat. § 948.0125 and § 48.825, which are the two other statutes where that term appears. See McKellips, 361 Wis. 2d 773, ¶¶ 11-16. Although neither statute gives a definition of the term, some examples of a computerized communication system are provided: Section 948.0125 uses the term 13 times. Twelve times it refers to "messages sent 'on an electronic mail or other computerized communication system.1" McKellips, 361 Wis. 2d 773, ¶ 13 (citing § 947.0125(2)(a)-(f), (3)(a)-(f)). The thirteenth time "refers to messages sent 'from any computer terminal or other device that is used to send messages on an electronic mail or other computerized communication system.'" McKellips, 361 Wis. 2d 773, ¶ 13 (citing § 947.0125(3)(g)). Section 48.825 refers to communications 'by any computerized communication system, including by electronic mail, Internet site, Internet account, or any similar medium of communication provided via the Internet.'" McKellips, 361 Wis. 2d 773, ¶ 15. None of the examples in these statutes alters our conclusion that the cellphone here was used as a computer to communicate through a computerized cellular phone system in violation of Wis. Stat. § 948.075. Rather, these statutes support our conclusion that the legislature included the term "computerized communication system" to cover situations beyond the internet or email.
See State v. Olson, 2008 WI App 171, ¶ 1, 314 Wis. 2d 630, 762 N.W.2d 393 (defendant use of online chat room); State v. Schulpius, 2006 WI App 263, ¶ 2, 298 Wis. 2d 155, 726 N.W.2d 706 (defendant had computer conversations over the internet).
We acknowledge the amicus brief filed on behalf of the Wisconsin Association of Criminal Defense Lawyers (WACDL) alerting us to a potential flaw in Wis. JI-Criminal 2135. It points out that the instruction's omission of the qualifying "in violation of s. 948.02(1) or (2)," could create an issue when the person being communicated with is an adult posing as a child. Our analysis in this case does not impact this issue and therefore we do not address it. We encourage WACDL to raise this issue with the Criminal Jury Instructions Committee.
McKellips filed a document labeled as a petition for review of the denial of bail, while this case was pending, seeking release on cash bond based on the court of appeals' decision reversing his conviction and ordering a new trial. Because we have reversed the court of appeals, we are denying his request labeled as a petition for review on the bail matter in a separate order being issued today.
All subsequent references to the Wisconsin Statutes are to the 2013-14 version unless otherwise indicated.