Do you know how to use cell phone signal shielding?

1, the use of mobile phone shielding device is relatively simple, take two common models as examples: one is the shielding device with built-in antenna in plastic shell, which can be used directly when plugged in; Then there is the shielding device of the external antenna with metal shell. When in use, the antenna is screwed on first, and then plugged in for use.

2. Before using the mobile phone shield, first look at whether the shield is an internal antenna with a plastic case or an external antenna with a metal case. If it is the former, it can be directly plugged in; If it is the latter, screw the frequency interface on the corresponding antenna of the fuselage first, and then plug it in.

3. From the appearance, signal shielding can be divided into plastic shell internal antenna and metal shell external antenna. If it is an antenna built in a plastic shell, it can be used by plugging in the power supply; If it is an external antenna with a metal shell, first screw on the frequency interface of the antenna corresponding to the fuselage, and then plug it in and you can use it.

4. According to this communication principle, the mobile phone signal shield scans from the low-end frequency of the forward channel to the high-end at a certain speed during the working process. This scanning speed will cause garbled interference to the message signal received by the mobile phone, and the mobile phone can't detect the normal data sent by the base station, which leads to the failure of the mobile phone to establish a connection with the base station.

5. Method of shielding cell phone signal: directly turn on the flight mode of the cell phone, turn off the carrier network and cellular mobile network of the cell phone, and turn off the wireless local area network. Directly turn on the flight mode of the mobile phone, the mobile phone can't receive any signal, and all short messages can't be used. Click Settings-Flight Mode.

6. The mobile phone signal is shielded by the shielding device, so that the mobile phone cannot accept the signal emitted by the signal tower to shield the mobile phone signal. Mobile phone shielding devices are now allowed in the examination room to prevent candidates from cheating. The universal 3G mobile phone signal shield MDPB-04 can learn.