I have just bought a SoundSync Drive and successfully set it up in my car. I was easily able to connect it via Bluetooth via iPhone. I was able to play music and make calls over it. I then disconnected and successfully connected it to my wife's iPhone. So far so good...
When I tried to play music via my wife's iPhone and I was completely unable to reconnect. Same with my phone. I tried removing it from the power & aux connections, rebooting every device (including the car!) and it completely refuses to connect. Nothing works.
I've run out of ideas.....anyone else got any?!