Ibrahim Dias
Networks today are becoming continuously complex, with the addition of new kinds of services and heterogeneous networks collaborating as whole entities. Due to the diverse mobile services and development in wireless networks (e.g. GSM), enormous number of people employs mobile devices as their communication. Global System for Mobile Communication Networks (GSM) is the most widely used mobile network in the world dating back to more than a decade ago, which provides good speech quality, low terminal and service cost, support for international roaming, support for handheld terminal.
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