Can I use an Unlocked UK Iphone 4S in the US temporarily?

I believe my phone has been unlocked. Its on the Vodafone carrier in the UK at the moment. I have to go back to the states for a few days and would like to just pop a pay as you go sim card in from the US until I come back then put the vodafone sim card back in. Is this possible? If so, what is the process, do i just pop the sim card out, put the new one in and go?

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