I have the treo 700p. For the most part the bluetooth works fairly well with my bmw750il navigation system but when I use the built in dial pad that comes with the car to access the sprint voice dial which you have to push *and then the send button it doesn't work. If I use the same proceedure on the treo itself it works fine and goes through the navigation system. I don't know why it works using the 700p phone itself but not the built in key pad that bmw provides. I realize that the bmw is not fully compatible with the treo 750p but in my old lexus that was the case also but I used work arounds that got me through until the 650p had the proper update.. Is their anyone out their with suggestions. I wish sprint had a regular number to dial instead of * send button...Saul Stockhamer