My Iphone Broke, if i bought a used iphone could I put my sim card into that one and use it?

So I have at&T and my iphone broke. I temporarily would like to buy a used 4s to use to for a little while before I buy a brand new iphone. If I bought a used Iphone 4s could I put my old sim card in and use it?

It depends on your sim card size if your going from 5 to 4s youll have to get a new sim. Micro sim

Yes, if it's an ATT or unlocked. Best luck.

As long as the phone is AT&T or unlocked, you won't have any problem with using the new phone with the old SIM.

Yes, Before swap your sim. Make sure it's AT&T network based phone or unlocked phone and check your sim card size. If it's fit on your iphone 4s. If you have a other network locked phone, you will need to unlock your phone. For unlocking you can approach your service provider or else try to buy an unlocking service from any one of the online unlocking service provider like http://www.superunlockcodes.com/apple-iphone-4s/rs5wp9/ I hope it will be very useful to you.