How to use a virgin mobile iPhone 4S in Ecuador?

So I bought an unlocked iPhone 4S from virgin mobile here in America. ( I'm going to Ecuador this summer ) And I was wondering if I take it to Ecuador this summer and use their carrier called "Claro", will I still be able to use virgin mobile when I come back to America?

If its unlocked it will work with claro, porta and movistar but it will not work with alegro. They are primarily CDMA.

@Rodney, did the iPhone 4s work in Ecuador?

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