How to bring a mobile phone into school without being checked?

1. Needless to say, the best way is to turn it off! At present, no instrument can detect the turned-off mobile phone except the military-grade detector for anti-espionage and anti-reconnaissance!

2. If your mobile phone has flight mode (basically all mtk domestic mobile phones have this function). Flight mode is mainly used in airplanes, and it is turned on, but there is no communication network to send and receive, that is, you can't send text messages or make phone calls. Flight mode is on and the instrument can't detect it.

3. Bluetooth transceiver and wifi/wapi network can't detect it either, because they are both 2.4GHz frequencies. So it's ok to turn on Bluetooth to send files or text messages in airplane mode (don't say you didn't know Bluetooth can send text messages), or it's undetectable to turn on wifi to surf the Internet and visit qq in airplane mode (but it seems difficult for our school to find hot spots). . . )

In addition, the frequency band of cmmb mobile TV is 2.5GHz, which is also undetectable.

According to the internet, the radio can play an interference role. The FM band of the radio is 88- 108 MHz, and the AM band is 535-1605khz. It seems that although the radio is not in the frequency band of the instrument, it will have some interference, but it is very small.

5. Conductive metal objects will also interfere, but only interfere. After you are detected as a mobile phone, you say it is a key, and the teacher may let you go if he is absent-minded or free. So the internet said that you can put your mobile phone in an iron box and wait.

6. It is absolutely useful to install a real insulated shielding box, but it is no different from flying mode, except that it is more troublesome to install it in the box.

7. The interphone frequency band is allocated to the public security: 350MHZ；; Coast: 220MHZ；; Amateur: 433MHZ；; Cluster: 800MHZ；; So you should know the walkie-talkie

(with TV: 100-800MHZ)

. . . . . .

What I analyzed above is very high-end instruments. If our school uses ordinary or low-end goods, then many situations will not be detected! But it's still foolproof!

Personally, I suggest turning it off directly and cutting into flight mode with shortcut keys!