T-Mobile recently announced the details their plans to upgrade to LTE in 2013 thanks to a chunk of the 1900 MHz spectrum they earned through the busted-up AT&T deal. Those upgrades will also include enhancements on HSPA+, which should support the iPhone. Of course, that doesn't necessarily mean that T-Mobile will be selling the iPhone any time soon, but they've been more than happy to accommodate iPhone-toting AT&T expatriates so far, and this HSPA+ expansion should make that job much easier.
We're holding out for an LTE-capable iPhone 5 to hit the streets this fall, but even if T-Mobile has their first LTE markets ready early on in 2013 and manages to lock down an agreement with Apple to sell it, it will be at least three or four months behind the other major U.S. service providers. That's going to be a steep handicap, especially considering Sprint will keep offering unlimited plans for the foreseeable future.
Any T-Mobile customers out there itching to get HSPA+ on their iPhones? Would any of you on AT&T be willing to switch to T-Mobile if you knew you could keep your wireless data speeds?