Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
For another one? I want 6.1.2.

I think you are confusing software version with model number. Any new device is likely to be running either the newest iOS version, or iOS 6.0, which can only be updated to 6.1.3 which you have...

And like the other guys said, T-Mobile isn't going to just exchange the phone out ..:rolleyes:
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.