Iphone "BLUETREK METAL" headset problem audio stream? - iphone stream headset

I have an unlocked and Jailbroken Iphone 3g with firmware 3.0. How do I start the video (audio) or play audio files, hear in the headset, it is for the WAZ audio streaming?

Or is the iPhone compatible with Bluetooth just another trick, or is my camera? What does the work for incoming calls thoug cursed.

It is the only way to buy Apple's Bluetooth headset or what?