What to use to Unlock AT&T iPhone?

I have an AT&T iPhone that I would like to factory unlock in less than 24 hours (48 MAX.) but since local and nearby stores refuse to unlock it, what websites are great to use? Which websites have you guys used? How much money did they cost, and how long did they take?
P.S. I have an AT&T iPhone 5 in which I wish to use for my T-Mobile account.

You can try but it's not going to happen in 48 hours. Impossible. Even if you had the cash. It takes sometimes two weeks for the code to run through Apple's servers. Here's the list. Some are scams, some work. I doubt any are totally free. Best luck.
https://www.youtube.com/...+iphone+5+

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