PTT – Push to Talk
PTT is a walkie-talkie style service that uses the services of cellular network technology such as GSM (Global System for Mobile communications), GPRS (General Packet Radio Service) and 3G (Third Generation) systems such as UMTS (Universal Mobile telecommunications System) and CDMA2000¨. It was first offered as a service over ten years ago by Nextel, a North American carrier.
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