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We do not know being followed in many cases, in order to prevent such incidents, GPS blocker have used as a guard against such incidents occur.
Phone signal is not really the radiation, I think cell phone signal jammer can give you the answer, you try to know, huh.
I'm curious how much can the Jammer shielding in the end range, is not there can be 1 km away, it would be too crazy
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.
Knowledge: the signal is actually encrypted transmission of electromagnetic waves, the signal peaks and troughs on behalf of 1,0. cell phone jammer play a superposition of waves, resulting in the shielding effect.