Possible to unlock Sprint Iphone 4?

Ok I have a Sprint iphone 4 CDMA, My contract is satisfied in a month, then I can leave Sprint, my question is after I finish up my contract, can I call Sprint to get them to factory unlock ( if even possible) my iphone so I can go to a prepaid CDMA service, like virgin mobile? Is it even possible to factory unlock or unlock a sprint iphone 4. This is the CDMA version and DOES NOT feature a sim card, or a sim card slot.

There are no carriers that accept the Sprint iPhone 4 at present time. Virgin Mobile does not accept outside phones at all, for example. Ting does not accept the iPhone at all (all models), ditto for Boost Mobile and Page Plus.

Only GSM iPhone 4 phones right now can be used with other carriers.

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