Fido

I am thinking about buying a unlocked nexus s from the states, will it work with my sim card?    Thanks in advance   ***Edited to add labels***  

At first it asks you if you would like ti connect to 3G, Wifi, or something else. Anyway, I connected to my home wifi, and played on it for a bit. Then I went to Log and went under Data, At the bottom it says Wifi, and my Wifi name, then on top of it...