With the rapid development of domestic economy, various high-tech products have been applied, and the application of 5g network has brought the communication network to a new height. The upgrading of 5g network has not only brought many problems to the public, but also brought many problems to some occasions that do not need mobile networks. For example, the recent college entrance examination, which is a very important examination that determines the future life of students, However, there are always some candidates who will choose to cheat in the exam in order to be opportunistic. In order to put an end to this kind of cheating in the examination room, mobile phone jammers have been applied. These signal jamming instruments have a good restraining effect on those who practice favoritism and fraud.

At present, mobile phone jammers are widely used and become one of the indispensable equipment for technical defense in school examination halls. However, these signal jamming devices currently on the market have many brands and models, and the quality of products is uneven. If they are selected incorrectly, they will not work when used. A suitable mobile phone jammer is not available. To choose a mobile phone jammer, first of all, you need to know what mobile network signals are available locally. All mobile network signals will be different in different environments. You can choose a suitable jamming device according to the frequency band of interference required by the environment.