How to unlock iphone 4 without sim slot?

I have an iphone 4 for sprint it does not have a sim card slot and is running 5.1.1 and jailbroken is there any way to unlock this phone i repeat it does not have a sim card slot it there any way to unlock? I'm trying to get rid of my old number which is stuck on the phone because i lost it and found it

The purpose of unlocking is allowing GSM phones to work on all GSM carriers. So no, as with any CDMA phone. But what exactly do you want to do? You can just call sprint and have them change the account associated with the phone.

You can't unlock sprint phones.

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