In high schools, mobile phone signal jammers are often used during exams. Everyone knows that when college students take the College English Test Band 4 and Band 6, they are usually notified by the school to prohibit their mobile phones from entering the examination room during the exam, or to turn off their mobile phones and store them in a designated location. Some schools also use "mobile phone detectors" to search for whether any students have brought their mobile phones and turned them on. In this year's final exam, some middle schools also adopted mobile phone signal interference devices to prevent students from using SMS to cheat.

At noon yesterday, several girls from 57 Middle School who had just completed the final exam of a subject discussed at the school gate: "We used a mobile phone signal jammer for this exam, did your class use it?" "Our class's mobile phone signal was also interfered by the 'mobile phone signal jammer', even there was no signal in the toilet."... The students told the reporter that they were all freshmen, I have heard before that cell phone jammers will be used to block cell phone signals in college exams, but I didn't expect to encounter such things when I just entered high school.

Teacher Xin from the Youth League Committee of the Middle School said, "The school has indeed used a mobile phone signal jammer, and the entire school has purchased a total of more than ten mobile phone signal jammers. In this final exam, it is mainly placed in the classes of Senior One and Senior Three who participated in the exam this week, with one mobile phone signal shield for each class.".
During the interview, the reporter learned that there are still many schools using mobile phone signal jammers this year. The head of the university told the reporter, "Our school also has 7 mobile phone signal jammers. Although the high school exam has not yet started, the school will also use mobile phone signal jammers to screen mobile phone signals next week to ensure the fairness of the final exam." The head of the university also said that the school used mobile phone signal jammers in the exam last year, The main barrier is the mobile phone signal in the examination room, and the corridors, toilets, and playgrounds are not affected.