The Iphone has the SIM car slot at the top, you use a pin in the little hole to pop it out.

You do have to get the Iphone plan if you want to use any of the features on it, and also they charge $30 for that and $20 more for unlimited texts. My bill with just 450 minutes was still $100 a month, so I sold mine last week, Got bored with it and tired of paying so much.