The school uses the phone jammer to prevent students from cheating in the exam. The installation of the jammer reduces the burden of the teacher's invigilation and, to a certain extent, reduces the waste of human resources. In the classroom, some students secretly use their mobile phones to read novels, make phone calls, send messages and so on, which can be controlled by phone jammers. Up to now, more and more schools have chosen to install phone jammers, which means that jammers also play a very important role in schools.

As a very simple communication electronic device, mobile phone can easily obtain the desired answers from the Internet of Things. This small and easy to hide electronic device gives invigilators a headache. However, it is easy for the jammer to disturb the mobile phone signal. Once the device is turned on, the mobile phone cannot receive any signal, and students cannot cheat on the Internet through their mobile phones, fundamentally solving these problems. According to the distance between the on-site base stations, measure the on-site signal strength, consider the size of indoor space, and install phone jammers appropriately. This kind of jammer transmits interference signals similar to that of the base station, covers the signals transmitted by the mobile phone, thus destroying the connection between the mobile phone and the base station. The power of the phone jammer will probably exceed the normal signal strength, thus achieving the desired interference effect and ensuring the normal progress of the exam.