I had AT&T for my regular cell phone, then it switched over to being Cingular. I have been very happy with the service for many years now, and have never thought about switching.

But I want faster than EDGE, and I want official DUN support, I don't want to be hacking or worried that I will get snagged for violating TOS. So I had to go with Sprint for the 770.

BTW when the A900 is attached to the KR1, it does not cut off service, it's continuous until the battery dies.