Is the tmobile iPhone 5 already unlock? And will the tmobile 5 work on AT&T?

I have recently been looking at buying an iPhone 5 and I found someone, but they have tmobile an I have AT&T. Will it work on AT&T? Also, how much would the newer SIM card be?

The TMO phn just came out. I doubt it's legit. They have some slight differences. Actually the TMO iPhone is superior because of the digital voice option which is not supported on ATT. I would wait now that TMO and metro just finished their merger.

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