Can sprint iphone without sim card slot be unlocked?

Can sprint iphone without sim card slot be unlocked? Iphone 4 and if it can be unlocked how?
also a Verizon iphone 4s both running on 5.1.1

Yes, it can be unlocked, but if you wanted to use it with another carrier, the company would have to be a CDMA wireless company, and they would need to flash it to their network.

and the verizon iPhone 4s can too… You would need to then install a GSM SIM card or have a CDMA company flash it to their network.

Yes it can be unlocked by the carrier.

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