Samsung a-877 on t-mobile

I JUST GET A NEW PHONE SAMSUNG A-877 FROM ATT I ALREDY UNLOCK BECAUSE MY SERVICE IS FROM T-MOBILE I CAN CALL AND I RECEIVED CALL
BUT I CAN'T USE T-ZONES, ICAN'T RECEIVED WINDOWS LIVE MESSANGER, SOME BODY KNOW HOW CAN I CHANGE THE BOWER OF THE PHONE MY PLAN IN T-MOBILE IS UNLIMITED CALL AND UNLIMITED MASAGE.
THANK YOU

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hey man what code did u use 2 unlock it im currently deployed 2 afganistan and it would really help me