How could i take out the sim card from my iPhone 4S (Sprint)

Ineed a little of help here with my iPhone 4S From sprint. Is cause i want to sell it but the problem here is that i'm thinking that if i sell it, The person that isell it with will use my account info. Because icant take out the sim card from my iPhone. Because on youtube all videos of (How to take out the same card of your iPhone 4s (Sprint), Have a sim card slot on the side. But mines dosent. So how could i take out the sim card or how could i sell it?

Sprint doesn't use sim card. Your number should be programmed into the phone and you will have to ask the people at Sprint store for advice, since they do somethings to get your number/account info out.