Can i use a AT&T nokia lumia 520 with out a sim card?

I'm thinking of buying an Nokia lumia 520 in the next couple days and the listing i found is a AT&T Nokia lumia 520 with no sim card i've had bad experiences with AT&T smartphones before i once ordered a AT&T iPhone 3GS with no sim and it didn't work so if anyone could tell me if AT&T Nokia lumias with no sims can be used as iPod touch kind of thing i would appreciate it.

Of course! I have one without a Sim card. 10 points please?