OMA Push to Talk Over Cellular (POC)
This service allows people to use their phones as walkie-talkies, merely pushing a button to talk to another user or group of users. Users can check whether their 'buddies' (people pre-selected from their contacts' list) are connected before activating the service. Only one person can talk at a time and all other participants hear the speech.
The service has been successful in the U.S. with business users and a number of European GSM operators are now considering PoC. In order to use the service, users need to be a customer of an operator that has launched PoC, and have a compatible handset that has the PoC software built into the device.
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