T-Mobile really seems to have turned their act around. I was with them for a long time but went to AT&T for the 3Gs (at the time being able to tether at a decent speed was worth it).

Now, I don't know. I'm on Verizon and Verizon's coverage was surprisingly good in places I've never had GSM coverage. I'm not sure if I could go back. I wish I could, though - I'd love to give them my support for things like that.