After the wifi jammer is turned on, it can block all 2G 3G 4G signals, 2.4G WIFI signals, and Bluetooth signals under the three operators of China Mobile, China Unicom, and Telecom. The frequencies emitted by wireless routers, thus achieving the purpose of shielding them. After the mobile phone is blocked, it does not necessarily show that there is no service. There may be one or two bars of signal, but this is virtual, and you cannot make calls or surf the Internet. Specifically, the phone that is closer to the wifi signal jammer will basically show no service, and the phone that is farther away from the wifi jammer device will have a signal grid. The farther away, the more signal grids, until the phone can communicate with the Internet.
Interference, the mobile phone cannot detect the normal microwave signal data sent from the base station, so the mobile phone cannot establish a connection with the base station within a certain range, so as to achieve the purpose of disabling the use of the mobile phone. The mobile phone appears to be searching the network, with no signal, no service system, etc.
Some places deliberately do not block the operator's 2G frequency band due to special needs. The 2G frequency band can be used for voice, text messages, and Internet access. But now operators are vigorously developing 3G and 4G networks, and 2G networks are only responsible for voice and text messages. For example, China Mobile, when making voice calls, will jump back to the 2G frequency band for communication if the VOL call function is not enabled. , Now using 2G to surf the Internet is particularly slow.
When the wifi frequency jammer is turned on, the mobile phone cannot make calls, receive calls and surf the Internet, but it will not interfere with the work of other electronic equipment, thus ensuring the quietness and confidentiality of the installation site. damage.
