How to unlock my iPhone 4 that is locked to Sprint?

How do I unlock my iPhone 4 that is locked to Sprint?

The iPhone 4 can't be unlocked as it does not have a SIM slot. However, it can be "flashed" to another CDMA provider, such as Boost, PagePlus, Cricket, etc.

Hey you could check this out
http://www.appleunlockguides.com/unlock-iphone-4-and-4s/
Haven't tried it but could be worth a shot.

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