AT&T Unlocked HTC One M9 mobile data not working

hachem10

    I recently bought an HTC One M9 that was on AT&T, and I processed an unlock for it. The weird thing about it was that I put in my T-Mobile sim card in the phone and it did not ask for the unlock code that I got from AT&T. So I'm guessing that it was just unlocked then, but the mobile data does not work. I can make and receive calls and texts just fine. I went into the settings and put in the T-Mobile APN settings that are listed online and the mobile data still would not work. The phone is clean esn. Please, I need some help. Thank you

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