Do Sprint & Verizon Iphone 4 Carry a Sim Card Slot?

Does the sprint and verizon iphone 4 carry a sim card slot so that i can use the phone with another network?

Added (1). I know it has to be unlocked first but do they'?

Even if it has a sim card slot it would have to be unlocked to use with different carriers.

No. CDMA phone, CDMA network.

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