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We have regular contact with mobile phone jammer in the army, in order to prevent the phone bomb attacks, it is necessary.
Knowledge: GPS signal is referred to U.S. commercial GPS. The GPS jammer is such a signal shielding devices, can be used in vehicle tracking and so on.
We can use more equipment to solve the problem you are experiencing.
Cell phone signal blocker is illegal, but in some cases, such as the examination room, the battlefield, special needs, using mobile phone blocker can be a good solution to the prevailing situation.
Some shielded tool does not really shielded signal, and mobile phone jammer to be true, it produces interference by superimposing the signal waveform, thus significantly weakening the signal to disappear.