Can I use the Verizon iPhone on Sprint or other CDMA networks?

Will the CDMA Verizon iPhone 4 work on the Sprint network? Yes. Will you be able to use it on the Sprint network? Probably not.

The CDMA iPhone (Verizon), unlike the GSM iPhone (AT&T, Orange, etc), isn't locked. That said, CDMA providers have full control over what devices operate on their network and don't typically allow outsiders.

So while you CAN use the Verizon iPhone 4 on other CDMA networks, you probably won't be able to.

Confused? Read on for more info: Verizon iPhone Unlock: Please Stop the Nonsense

Yes! Just jailbreak of-course. Then install Cydia, and download the Verizon Carrier Bundle.
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So it is possible to jailbreak iPhone 4S frm verizon and use it for sprint