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If you want the information hard enough, be it a handheld VHF PTT radio or a Global GSM device, you can get it.
Power and range come into it. I've dabbled in daily (Even 6 hourly changing) encrypted SIM cards for various people and agencies and its pretty good, if the client remembers to do what you have told him to do.
If you have the will, capability and resources to exploit communications there is very little you can do about it.
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The idea is to die young.........as late as possible.
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