The current mobile phone signal jammers are all du-band, which can block all the 2G 3G 4G signals, 2.4G WIFI signals and Bluetooth signals under all three operators of China Mobile, China Unicom and Telecom. Its principle is Interfering with the frequency sent by the base station and wireless router by the mobile phone through its own frequency, so as to achieve the purpose of shielding them.
Some posts say that if the mobile phone’s network operator automatically selects this field to be closed, the mobile phone will not be blocked. In fact, this is not correct, because the mobile cell phone jammer all mobile phone frequencies under the three operators. So no matter how you switch, you will be blocked, and you cannot avoid being blocked by purchasing any software.
This cannot be avoided by cracking the number band and band, because no matter which number or band you use, it is within its shielding range. There is also Bluetooth software that is not acceptable, because its frequency will also be blocked by jammers. The only way is to install a cell phone signal amplifier near the place where the cell phone signal jammer is used to counter it.