When I first bought my Palm Treo 650 a couple of years ago its bluetooth interacted flawlessly with my Toyota Prius’ bluetooth. I was able to take calls and end calls by pushing a button on the steering wheel with the audio coming through the stereo’s speakers even if the radio/CD player was turned off, and a microphone in the ceiling picking up my voice. After I updated the Treo software to 1.16 (?) last year my car could not hook up with the phone. I contacted Palm and they claimed it would have to be a Toyota problem because their bluetooth implementation was correct and their update had nothing to do with the connection problems. Curious then, that the bluetooth connection to my Prius works once again after the latest Treo software update to 1.20.