[Tybalt39]

Once you are paired the first time you shouldn't need to go through the process again. If you are using Sense 2.5, put a shortcut to the COMM Manager or the bluetooth app on the Today screen. If you aren't using Sense at all, put a shortcut on the WM today page. Then just turn on bluetooth when you want to use it. Or just leave bluetooth on all the time (eats the battery faster).

Your phone will remember multiple devices. You shouldn't have to pair again as long as you don't pair the FM transmitter with a different device. I use a bluetooth receiver at home on my stereo system. I can listen to both the stereo and my bluetooth earphones at the same time, plus use a bluetooth headset for phone calls. Multiple devices used simultaneously is no problem for this phone!