Actually, now sii92 is really interested in getting a Windows phone, haha. I'm not going to get into the smartphone world for awhile even still, but I follow these shenanigans from time to time.
T-Mobile are updating all their towers and hopefully still expanding coverage, but I'm unsure of their ability to compete with AT&T and Verizon in the iPhone market. I think all it will mean is fewer customers lost to those other companies because of iPhone availability.