Use Iphone 3g Without Sim Card? Problem or Not?

Xs cargo is selling this iphone 3g 8gb for like 150$, In the description it sais ready to be used on rogers, fido, or telus i think, but does that mean its unlocked? Like can i use it as a ipod ''till'' i get it activated on rogers. I googled this, but everyone bought there iphone with a plan and it needs to be activated with that Sim card etc. Like on first boot, it shows the screen then its locked and can only be unlocked by using a sim card, I'm wondering if il have that problem, like can i only use it if its on a plan etc… I'm thinking i won't need to use a sim card since i didn't buy it with anyhing but i'm not sure… I just want to be able to use it on Wi-Fi. And i know this iphone is TERRIBLY out of date… But i just broke my tablet with 3g, and i'm gonna buy this if i can do that, just till christmas. Does anybody know if i can use it as like a ipod in this situation? Or will i be only able to use it when activated by a sim card?

Added (1). It Sais Exactly: Factory Unlocked, Runs on the following, Rogers Bell and fido

If it's on IOS6 or above, you shouldn't have any problem. If before that, you will need to activate with a sim first.