Cell phone jammer in the use of very simple, only need to install the corresponding antenna, turn on the switch can shield mobile phone signals corresponding to it.
In Canada, we care about the issues discussed aspects of the signal, mobile phone jammer are very small areas and purposes.
What mobile phone jammer in the examination room is the real meaning? That is to make cheating candidates signal disappears, so that everyone fair exam.
GSM international roaming refers to the GSM cellular mobile telephone users when they leave their home network, you can still continue to use the GSM mobile phone network to communicate with other countries and in other regions. The GSM Jammer can be very easy to block these signals.
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.