I bought a $10 FM transmitter from Walmart and plugged it into the back of the car dock. I had to download a "TW_cardock_patch" or something like that. There's more than one thread on here on where to get the real link. It will only work if you're rooted though. Once you do that: throw the phone in the cradle, turn on the FM transmitter and you should be good. When you connect the phone to the cradle your Speaker Icon should have a line through. If it does you should be all set! Hope that helps.