Hey Eric,

I was at the Cingular store yesterday. The W810i is the next generation to the T630 and T637. I have the T637, which is an approved phone, and it is fully compatible. I don't see a reason why the W810i would not be.

Cingular offers 30 days return policy. I suggest you get the phone and try it for a day. If it doesn't work, just return it.

I bought yesterday the Samsung D807. Great phone, but it doesn't work with BMW ULF. It's going back today...

Good luck!

Jose