I'd be wary. It makes no sense for a company like T-Mobile to pretend to welcome customers on another network. People will know, soon enough, if AT&T has lost its exclusivity. If it's just T-Mobile that gets it, it makes little sense to switch considering how small their 3G network is. We'll see. I'm beginning to think that the iPhone will not be covered, as an announcement like this will overshadow the Tablet. Instead, I think the Tablet will use AT&T, Verizon, Sprint and T-Mobile for data.