A cell phone jammer is a device that emits signals in the same frequency that cell phones 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.
Cell phone blocker to block the 3G 4G mobile phone signal similar, in the process of buying, we should note that we need to distinguish the type of signal blocking.
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.
A lot of people started talking about cell phone blocker, as more and more mobile phones being used now is a social networking community.
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