80Push to talk (PTT) over cellular is a two-way radio service available over aGPRS cellular network (network service).You can use PTT to have a conversation with one person or with a group ofpeople (channel) having compatible devices. While you are connected to thePTT service, you can use the other functions of the phone.To check availability and costs, and to subscribe to the service, contact yournetwork operator. Roaming services may be more limited than for normal calls.Before you can use the PTT service, you must define the required PTT servicesettings. See "PTT settings," p. 86 and "Configuration settings," p. 87.■ PTT channelsA PTT channel comprises a group of people (for example, friends or a workteam)who joined the channel after they were invited to. When you call a channel,all members joined to the channel hear the call simultaneously.There are different types of PTT channels:Public channel — Every channel member can invite other persons.Private channel — Only persons which receive an invitation by the channelcreator can join in.Provisioned channel — A permanent channel is created by the service provider.You can set the status of each channel to Active or Inactive.The number of active channels and the number of members per channel islimited. Contact your service provider for details.Create a channelTo add a channel, select Menu > Push to talk > Add channel and enter thesettings in the form fields:
