i have att phone want to use a motorola v300

i have att nokia phone...but i want to use my att sim card on a tmobile motorola v300, when i tried to enter the code, after a couple of tries it said "please call service provider"..by any chance does anyone know the subside code and how do i change it....

please HELP!!!!!!!

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You must use a remote server for subsidy code (online).
I'm in NYC and can unlock the phone for you if you are in the
area.