How to change the carrier on a jailbroken iPhone 4?

And I don't mean the logo, I mean the actual carrier. I currently have Sprint that turned off my service for not paying my bill on time (whoops) and I was looking online and Virgin Mobiles iPhone plans are very cheap. My phone is already jailbroken so I don't need to do that.

Nope.sprint iphones are useless. They only work on sprint

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