How do I unlock a Samsung Flight ?

I’m a T-Mobile customer and my T-Mobile Samsung Gravity 3 broke. So my friend offered to let me use her Samsung Flight 2, which is an AT&T phone. Does anybody know any trustworthy websites on how to unlock this phone? It says to put a 4-8 digit code. Most codes have (#) and (*)but it says those signs are unacceptable. I am pissed off by this type of situation and not getting what to do in this situation? Please help.

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