how to block gsm signal

The cell phone signal blocking box causes garbled interference in the message signal received by the mobile phone due to the frequency sweep signal (increase the ratio of the noise signal to the device threshold), the mobile phone cannot receive the normal 4g data sent by the base station, so that the mobile phone cannot establish a normal connection with the base station , So that the mobile phone is separated from the base station communication network. The mobile phone shows the phenomenon of no signal and no service system in the search network, which achieves the blocking effect.

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