Global System for Mobile Communication GSM is an abbreviated cellular communications technology that is digital. GSM technology is widely used in mobile communications, especially mobile phones. This uses microwave technology and sending signals that are divided by time, so that the signal information sent will reach its destination. GSM become the global standard for mobile communications as well as a technology provider of the most widely used of people around the world.
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Source : http://id.wikipedia.org/wiki/GSM
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