Iphone 4 not working on Straight Talk?

I just got an iphone on Ebay that was great until I tried to activate it on Straight talk. It is a LOCKED jailbroken iphone 4 ATT. I purchased the straight talk micro SIM card for ATT carriers. The phone says 'No Service' and I can't make calls. I ported my number from Crickett, and now I don't have a cell phone… I installed the card and followed the directions, and after 3 hours on the phone with customer service, I was told that there could be a problem with the phone itself and that I would not be getting a refund. I contacted the seller and am waiting for a response. Anyone else have this problem?

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You need an unlocked iphone 4.
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