Originally Posted by golfer4life

List of compatible phones from BMWUSA website

http://www.wireless4bmw.com/phones.html
http://www.wireless4bmw.com/phones2.html

As jasonrhcastle indicated, WM6 will fix my Treo 750 issue, this was also verified by my telecom resources. Unfortunately, the official upgrade (Treo 750 AT&T version) is not available yet, only hacks that are floating around the web. I've done a lot of testing for the last few days and it looks like most regular cell phones with BT capabilities that are not on the BMW list will work with the E70 car kit with little problems. Only if you have a PDA, Smart Phone or Pocket PC unit that you will experience problems if it's not on the "BMW compatible" list. I tested an HTC 8125 Pocket PC (not on the list)with a WM6 hack and it seems to work fine.

So going back to hans' original posting, the HTC P3600 (not on the list)was originally released with WM5 but if you have the one with the WM6 OS, then it would probably work on the E70.

Please take this with a grain of salt, I'm just providing info based on research and personal testing. The bottom line is, if BWM says it's not compatible, expect a hit and miss BT connectivity.