Yes, it will work on T-mobile once it is unlocked but you will not have access to T-mobile's 3G data since the phone lacks the 1700 mhz data frequency.
I just purchased an at&t blackjack from ebay that is not unlocked. I havent received it yet but i am planing on buying the unlock code from ebay. They sell it for $2.63. Will the phone work with my t-mobile prepaid sim card?
Can u guys give me instructions on how to unlock it once i get it?