How to find out which iphone models have a SIM card slot?

I'm trying to buy a used iphone 4 or 4S from ebay, I know that I need to pick and iphone that has a SIM card slot and I know that some iphones are locked to their carrier and do not have a sim card at all. Is there somewhere that I can look up the model numbers or something so I can make sure I get the right one?

Added (1). Thank you.

If the carrier is GSM, the phone uses a sim card.AT&T and T-Mobile are GSM carriers. Sprint and Verizon use CDMA.

1. Locate the Micro SIM tray on your iPhone. On iPhone 4 models, it is located on the right side edge of the device. On iPhone 3GS and earlier models, the tray is on the top edge. The tray is flush with the iPhone case and is a long oval shape with a hole at one end.
2. Insert a SIM eject tool or one end of a thin paper clip into the hole on the Micro SIM tray and push straight in to pop out the tray.
3. Gently remove the MIcro SIM card and push the tray back into the iPhone case.

The Sprint & Verizon models should be avoided in the case of the 4. The 4S is a GSM/CDMA phone which would work on either, but to play it safe look for AT&T models of those as well.

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