If you need to be quiet, you can turn on the jammer and the phone is in a signal state to avoid the interference of the phone ringing. Of course, wifi jammer are also used in many areas, such as classrooms, to prevent student fraud. In prisons, in order to prevent interfering with remotely controlled prisoners from communicating with the radio to communicate with external jailbreaks. This is a very useful tool to prevent signal propagation. We have recently designed a variety of WiFi signal interference devices that can interfere with wireless networks well.
