Leeza,
no. tmobile usa havent release its 3G network yet. hopefully it will come out this summer. it has been delayed for almost two years because dept of defense apparently hasn't closed down its own network - 1700mhz bandwidth frequency before that will be passed out to tmobile.
Verizon, Sprint, and ATT are only ones that have 3G networks so you can tether your mobile to laptop to call anyone through VRS. there is potential that at&t will release two way video calling anytime soon. you can chat anyone on your own mobile like you saw a a japanese girl signing on her own mobile in Babel the movie. right now att has only one way video calling which i am not interested in. some wireless carriers in Europe already have two ways video calling for few years. ugh ugh...