I bought a iPhone from a person. it was for AT

I need help. I put in a  TMobile card. Than, it send me a message saying
"SIM NOT VALID" the Sim card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier."
So please I need help. What I should I do.?

You will need that person you bought it from to request an unlock from AT&T.  The phone you bought is locked to AT&T and only AT&T can unlock it for you.  And AT&T only unlocks devices for people who are or were account holders with them.
Bottom line is only AT&T can unlock it for you, so contact the person you bought it from and ask them to put in an unlock request with AT&T.  If you cannot do that, then you are out of luck.

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