I read nokia`s home page and it says at my phone nokia 6670 support`s push to talk function and software.....!!! But i dont find that software any place...!!
Well you'd better contact your service provider and make sure that they support PTT as it is a network based service... and also make sure that the ppl with whom you communicate most are also using his service... the network providers may also fix u up with a PTT application if they support the service...