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Exam in the use of cell phone signal jammer is a very normal thing, it is not bound by law to use such a shielding signal.
GSM is the Global System for Mobile Communications acronym, meaning global mobile communication system, is one of the world is major cellular systems. GSM Jammer is shielded equipment such signals.
In Canada, we are always looking for quality of life, so cell phone jammer in everyday life to always be able to use.
We have regular contact with mobile phone jammer in the army, in order to prevent the phone bomb attacks, it is necessary.
Jamming Cell Phones and GPS Equipment is Against the Law