Can the mobile phone signal shielding device in the college entrance examination shield short messages?

At present, the mobile phone signal shields used in the college entrance examination are all full-band, which can shield all 2G 3G 4G signals, 2.4G WIFI signals and Bluetooth signals of China Mobile, China Unicom and China Telecom. Its principle is to interfere the mobile phone to receive the frequency sent by the base station and wireless router through its own frequency, so as to achieve the purpose of shielding.

So as long as the screen is on, the phone can't answer the phone, send text messages or surf the Internet.

This is inevitable for any number segment cracking or frequency band cracking, because no matter which number segment or frequency band you use, it is within its shielding range.

There is also Bluetooth software, because its frequency will also be shielded by shielding devices.

The only way is to install a cell phone signal amplifier near the place where cell phone signal shielding is used to compete with it.