There is a mobile phone screen in the examination room. Can I send text messages on my mobile phone? What is the control range of the shield? Is the toilet okay?

At present, the school's mobile phone signal shields 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. So as long as the screen is on, the mobile phone can't send text messages.

Generally, low-power mobile phone signal shielding is used in the examination room, one for each classroom and one for shielding the current classroom and door position. If you are in the toilet, you should be able to use your mobile phone normally, and the shielding layer cannot penetrate the toilet.