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So I have two iPhone 6s with unpaid balances, both with clean IMEI and not blacklisted. One from ATT and one from Sprint. I know I can't use the Sprint one on another account. But is there a way to unlock the sprint phone thats unpaid to work on another network? If there is a service, what is the cheapest one?

I would also like to know if I can use ATT one on another account without getting it unlocked? or do I have to get that one unlocked also? If so, whats the cheapest service to unlock an unpaid phone?

Bottom line is that I just want to resell both of these phones for the most I can. Both have unpaid bills, but both have clean IMEI and are not blacklisted. What is my best option to sell these phones at the most I can?

Any accurate information is appreciated :)