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.
It is illegal for any US citizen to use or sell a cell phone jammer
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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.
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.
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