Do iPhones by Sprint work in Europe with another carrier s SIM card?

I have an iPhone 4s and I'm currently under contract with Sprint which uses CDMA technology, but it also lets you use GSM in Europe. I'm aware about the fact that you can use it with a Sprint's SIM card over in Europe, but the roaming charges are outrageous. What i would like to do is, once my Sprint contract expires and i go to Europe, I wanna be able to use another carrier's SIM card. Is that even possible?

Sprint doesn't use SIM cards, they're CDMA. You can unlock the Sprint iPhone 4S and put European SIM in and use without problem though, but you need to get the phone unlocked first. Check online for factory unlock of iPhone 4S.

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