Just to clear things up since I think I had the most trouble getting it to work. Ninja helped a bunch

I have a Nokia 770 and a Cingular 8525, but it should work with any windows mobile 6 phone.

1. Upgrade Nokia 770 to the 2007 HE
2. Upgrade to Windows Mobile 6 on the phone
3. Install the all in one cab file from XDA-Developers. the exe is not needed
4. Turn on bluetooth on the phone and make it discoverable
5. Use the bluetooth utility on the 770, not the phone bluetooth but the normal bluetooth program and pair the phone and 770
6. Create a connection to your carrier, For me I dialed *99#, domain wap.cingular, Username WAP@CINGULARGPRS.COM, pw CINGULAR1 (you should know it if you have a data plan)
7. I then tried to connect I dont think it worked the first time. so I deleted the pairing on both the phone and 770, reset the phone only then repeated steps 4 and 5 and connected and it worked