WHICH IPHONE USES NORMAL SIM CARDS?

I HAVE A NORMAL SMART PHONE SIM CARD, BUT MY SMART PHONE JUST MEST UP TODAY. So I'm TRYING TO BUY A IPHONE OF CRAIGSLIST, AND I SAW SOME VIDEOS ON YOUTUBE THAT SAY THAT IPHONES HAVE A MINI SIM CARD. So I'm WORRIED ABOUT THIS WHICH I PHONE SHOULD I BUY? Help Help
CARRIER AT&T

3rd and 3s has normal 4 and 5 has mini, but you can go to salon and they make your sim into mini for free.

The only difference between a normal sim and a microsim (newer technology) is its size… If you have a normal sim, and you get the Iphone 4, 4s, or 5, then just take it to ATT and they'll trim it down for you for free… Or… Give you a new free microsim, transer you data/contacts/phone number/account data to the new microsim, for the iphone you bought for free

All AT&T iPhones use SIM cards.

I hate to break this to you but all the new ones are mini sim with the exception of the older models

The iPhone SIMS can either be cut at AT&T or you can cut them yourself. It's not a new type of sim card. You just have to make it smaller to fit into the iPhone. The first gen, and 3g and 3gs don't require that you have a micro-sim. I'd personally recommend one of the newer ones so you get all the new features and updates.