The influence of shielding devices on mobile phones.

At present, mobile phone signal shields on the market 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.

Therefore, as long as the signal shielding device of the mobile phone is turned on, the mobile phone will not be able to answer the phone, send text messages or surf the Internet normally.