We previously mentioned the glitch that allowed this capability with an active call, and then another that allowed it without an active phone call, but through the voicemail. The latest is the same as the previous voicemail glitch but is through the visual voicemail interface.

All you have to do is change the audio source for the visual voicemail to Bluetooth while listening to a message and then access the iPod software and start playing music. The downside is that the audio also plays out your iPhone’s speaker, unless you plug in some headphones.

However, plugging in headphones brings the audio through Bluetooth fun to an abrupt halt. So its almost there, if Apple would just do a quick update and add A2DP to both the iPhone and the iPod Touch, I am sure there are a lot of people that would love them for it, especially Bluetooth headphone manufacturers.

iPhone 1.1.1 “bug” unleashes music over Bluetooth [via Engadget Mobile]