Looks like T-Mobile’s serious about getting you to come to their network with your unlocked iPhone 5, even if they still don’t have a deal in place to sell them directly. What you see here is that T-Mobile is already ordering nano-SIMs, and you’ll be able to slap them into an unlocked iPhone 5 starting in mid-October. You won’t get LTE, of course, but if that doesn’t matter to you, you might save a few bucks.
Source: TMO-News