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In the prison cell phone signal jammer can be used to effectively control the offender contact with outsiders, so in these places use the phone jammers are legal.
I can not admit that sometimes you have to use illegal means to prevent the use of some signals, similar to the invigilator in the examination room, this time we need to use a Cell Phone Blocker
GPS jammer just to have a car and have a cigarette lighter, it is very simple.
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.
I do not know how can I buy cheap handy phone signal jammers. Can anyone tell me?
This site has sold, but very good.Cell Phone Jammer
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