From what I understand, the fancy integrated systems to let you use your iPhone (3G) as an iPod over your car audio system, shuts down the phone to prevent interference.
What solutions are available locally to play music from my iPhone over my car radio while still being able to make and receive calls (using the wired headset, bluetooth or other integration)
What solutions are available locally to play music from my iPhone over my car radio while still being able to make and receive calls (using the wired headset, bluetooth or other integration)