Since the advent of the mobile phone jammer, it has been trusted by examination rooms, schools, prisons and other units. In recent years, cheating on mobile phones has occurred in various national examinations, which has seriously affected the fairness and impartiality of examinations. For this reason, the state stipulates that mobile phone signal jammers should be equipped during major examinations to create a healthy and fair examination environment for candidates.

Therefore, the shielding device came into everyone’s sight. It was learned that the shielding device was used by candidates to cheat by using their mobile phones. I believe that those who have experienced large exams are not very unfamiliar, and they will hear about it before the exam. Cell phone signal jammers may be installed, and some test rooms will also inform candidates in advance to let them know that signal jammers are installed in the test room, so you must not be careful.

Mobile phone signal jammers are not only used in school dormitories, examination rooms, office meeting rooms, and secret-related places, but also mobile phone jammers. With the progress of society and the development of technology, mobile phones have become a device that people cannot leave their bodies. For middle school students, it is more important to influence what they say. Playing with mobile phones for a long time may affect their eyesight and, more seriously, neglect their studies, so school dormitories will install shielding devices to prevent students from playing mobile phones at night and not sleeping and affecting their sleep.

For families, many children are obsessed with online games and various video software. Parents feel annoyed by them. Therefore, signal shielding devices are placed in the children's room to prevent children from obsessing with mobile phones and delaying learning. With the popularization and use of jammers, everyone will worry about whether the jammer will affect the base station signal and the mobile phone signals of the surrounding residents.

Mobile phone signal jammers generally do not affect the base station. If the jammer's power is high, it may affect residents. The location of the school is generally not in the residential area, and the shielding power will not be too large. For a family, a small frequency shield is generally selected and placed in the room that needs to be shielded, and the shielding effect will be attenuated through the wall, so it will not affect the surrounding neighbors.

The principle of the signal jammer is that within a certain frequency range, the mobile phone and the base station are connected by radio waves, and the data and sound transmission is completed with a certain baud rate and modulation method. The jammer scans from the low end frequency of the forward channel to the high end at a certain speed during operation. This scanning speed can cause garbled interference in the message signal received by the mobile phone. The mobile phone cannot detect the normal data sent from the base station, so that the mobile phone cannot establish a connection with the base station and achieve the purpose of shielding the mobile phone signal. No service system and other phenomena.