Unblock a iphone 4 imei from carrier blacklist?

I have a iphone 4 from tmobile didn't pay the bill now the phone is blocked from further activation i'm thinking about selling it but i need to know will it stay as an ipod forever or can the imei be unblocked and reused on that network? I have factory unlocked it but still no luck it is basically an expensive ipod

I think there's no other way to remove it from the blacklist. It will be only removed from carrier blacklist if you pay the pre-termination fee from your carrier.

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