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Knowledge: mobile phone jammer
in some countries is within the exclusive tool, most people can not be used, is that legal constraints and security constraints. Only some institutions have the right to use.
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.
generally belongs only to those who have wealth, they have most of the world\'s wealth, it is also a symbol of wealth.