I have not had great sucess with my treo 750 and the vehicle bluetooth system. I have been able to get them to pair but they don't always want to connect and stay connected. You can be in the middle of a call and it will loose the bluetooth connection or even drop the call. My old K-Jam was pretty good and I had very few problems with that setup but I tired the 8525 for a while and it barely worked at all. Anyway, the bluetooth is hit and miss with and PDA phone and the BMW bluetooth system.