I have found that the following handsets work for me flawlessly:

- Motorola KRZR on Sprint (also transfers address book real-time)
- Motorola Q on Sprint (also transfers address book real-time)
- HTC S710 on any GSM Carrier (also transfers address book real-time)

I have found that the following do not work at all (and I REALLY worked hard to try to get them to work):

- Nokia N73
- Nokia E61

For the Nokia handsets, I have the latest firmware version for both. The same is true for the KRZR, Q and S710.

Joel