Can i use a iphone 5s without a sim card?

I never had a iphone before and i need some help i'm buying a used iphone online so how would this work? The description says that the phone has been factory reset and the icloud account has been removed and that the company is at&t / cricket. So can i use it without a sim if not how would i go about using it? I'm currently with cricket.

If you don't have a SIM card, you can't call, text, FaceTime, or anything like that. Without a sim card, you don't have a phone number. The only thing you can really do is use the internet with Wi-Fi, and play games.

The SIM is what connects you up to the carrier. Whatever company you use for your phone service will give you the SIM card free.

Make sure the phone isn't locked to a contract, or they won't be able to give you service unless you pay it off.

Yes you can use the iPhone without a SIM card. Of course, the phone part of it will not work, so it will be like a glorified iPod.

Now, you must use a SIM card at least once when you go through the setup process. If the phone is not unlocked, it has to be an AT&T SIM, however if the phone is unlocked, it can be any compatible SIM card; the card doesn't need to be active.

You'd need a SIM for the initial setup at least.