Swapping SIM cards while suspended Verizon wireless account?

I suspended my account because I"m going overseas in a couple of weeks. However, in order to go overseas and use the SIM slot (I have an iphone 4s which apparently I guess have cdma capability in the US and GSM overseas thus the SIM slot), I got it unlocked by the Verizon wireless team. Does that mean that I can technically pop in any GSM SIM card here too in the States? I was thinking maybe when I get back, since it's unlocked, I might try to put in a discount carrier's SIM card and see how I like it, since I"m on month by month with Verizon now, and if it works well, just cancel the Verizon's wireless account, since I"ll still be on suspension then. Does anyone know if this will work? If it makes a difference, I bought the iphone at the apple store.

If the phone is unlocked it should work with any GSM carrier.

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