Unlocking phone from an old At&t account to use at Alltel?

Okay, so I bought an HTC Wildfire (Alltel) off of Ebay (not my best idea, I know). This guy apparently bought this phone in a lot, and it is technically tied to an At&t account that was once an Alltel account (don't ask me how). However, this means that Alltel technically cannot remove the phone from the At&t account that it is linked to. Is there any way I can unlock the phone from the account myself? or is there a way to get At&t to do it for me?
 
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