Jailbroken sprint iphone 5 on tmobile or straight talk?

I know the sprint phone 5 is locked to only sprint or international gsm use. But what if its jailbroken is there some app or tweak in cydia? I had the iphone 4s jailbroken but converted to android. I would really love the iphone 5 on prepaid so any help would be great.

Just call the sprint company to take that away. Then call straighttalk so they can send u a special sim card which you will attach and make it straighttalk… Tada

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