When traveling, can I buy a SIM card to my iphone even though I'm still on a contract?

I'm traveling soon. I have verizon and their roaming service is very expensive. I was wondering if once I get to my destination country, can I buy a SIM card so that I can be able to obtain phone service while on my trip? If not, My iphone is still under contract, if I get my phone unlocked, then buy a SIM card, would that also be a problem?

That will work for international use if it is unlocked, but in the US you can only use a verizon sim, even if the phone is unlocked.

Roaming on any carrier is expensive. If your phone is not unlocked then this wouldn't work. Depending on which iPhone you have it may not be an option at all since it is on Verizon.

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