Question/Help

I have a facotry unlocked 4s. ( bought in and Apple Store in DC ) same with my child..

I am stationed overseas right now, I will be back in the USA next month for good.

Here is my question, I have always had Verizon for a cell company. but that was prior to owning our iPhones. So here is the question, can they be used with verizon? Can i get use them on a Verizon plan?

TIA