Samsung A177 Prepaid and t-mobile?

I want to get a at&t samsung a177 prepaid phone. I currently have a samsung behold from t-mobile and a t-mobile contract plan. I was wondering if I could take my sim card out of my samsung behold and put it into the at&t samsung a177. Would it work after i got the a177 unlocked? Do i need a data plan? THANKS! Will award 10 points to anyone who can help.
 
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