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Help cant receive or send texts/calls on unlocked captivate

Help cant receive or send texts/calls on unlocked captivate
i recently acquired a samsung captivate for at&t i unlocked it for tmobile and it works from time to time. After a while when i try to make calls or send and receive texts i cant anymore and i have to turn the phone back on and off in order to kinda "reboot" service. Is there anyway i can make my tmobile service consisent so i dont have to always turn the phone on and off. Also any tips to be able to send and receive picture messages. Thanks
 

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