T-Mobile Formally Launches LTE, New Pricing > I get what it is supposed to

I get what it is supposed to

They are not giving you a interest free loan to use a phone on someone elses network. It's for "their" network. Granted if you pay off the phone you can use it anywhere. But most likely they have tuned the phone for best performance on T-mobile which would be expected/demanded by T-mobile users.
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A democracy cannot exist as a permanent form of government. It can only exist until the corporations discover that money can elect representatives to vote themselves a monopoly, buy media to blame 'The Godless' and forced price inflation on the public.

reply to obeythelaw
Depends on the bands the phone supports, for the iPhone 5 you should be able too, the Model A1428 (GSM model) used by AT&T and now T-mobile supports AWS T-mobile LTE and Band 4 - AT&T LTE

reply to obeythelaw
You can return the phone to T-Mobile OR you can pay it off and keep it and unlock it and use it on AT&T. In the new iPhone's case, it will have a Pentaband HSPA+ chipset and all US LTE bands. So in that case you can freely switch over to AT&T and use it just fine if that's the case.

You can almost think of it as a lease (to own) where you either return it at the end or you get to keep it and do with it as you wish, which also includes using it on another carrier. If you cancel your lease before paying it off you just have to return it obviously (if you don't then they will go after you for the charges, again, obviously!).

reply to obeythelaw
The iPhone 5 T-Mobile is using is the same iPhone 5 AT&T is using (there will be a slight change to the cell radio to allow for HSPA on AWS spectrum).