How to avoid cell phone signal interference?

There are always cell phone jammers in schools and movie theaters. Is there any way to avoid the effects of jammers?

Topsignaljammer  2022.3

Method 1: Due to the rapid development of wireless networks, it has now developed to 4G networks, and many cinemas use older models of signal blocker, which can only block 2G networks such as PHS, China Mobile, and China Unicom, but not 3G networks. Even the current 4G network is helpless, the cracking method: use a 3G or 4G card.

Method 2: Band cracking method. Because the working principle of the school's blocker is to block the mobile phone by interfering with the mobile phone signal in the specified band, as long as the receiving and transmitting frequency of the mobile phone is modified, it can be prevented from being blocked. The blocker only blocks the mobile phone signal of 900-1800MHZ, while the mobile phone's receiving and transmitting The frequency is 850-1900MHZ, which is much larger than the shielding range of the jammer, so as long as the receiving and transmitting frequency of the mobile phone is adjusted to the maximum in the mobile phone settings, the mobile phone signal can be received normally.

Method 3: WIFI cracking method. This method has relatively high requirements on the environment, and the premise is that there must be an available wireless network around. Some cell phone signal blockers cannot block WIFI signals, but can communicate with the outside world.