Later, with the development of the second generation mobile phones (Second Generation) or 2 Ji (2G) to make the system have the capacity (Capacity) added. Up and security (Security) of signals sent and received. Prevention of using tools that did not register system 2 Ji will use the principle TD CDMA (TDMA-Time-Division Multiple Access) consists of Good am PS (DAMPS) of the United States. GSM (GSM) of Europe, Arsanilic Acid - 95 (IS-95) or CD m A1 (cdmaOne) of the United States and PDC. (PDC) of Japan.
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