How to put my SIM card in unlocked iphone?

My dad bought me an unlocked iphone from a pawn shop… I'm getting in the mail tmrw. My phone i have now isn't a smartphone its from a slider phone. It still will work tho right because the iphone is unlocked? Also, where do i stick the sim card? I think its on the side but there's a small little button like screw. How do i open it?

Well, the phone comes with a little tool to open it when it's bought new. You could probably still open it with a small sticklike object, such as a thin paper clip, an unused staple, or even a safety pin. Just insert it into the little hole and it'll pop open.

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