Can I get a SIM card for my IPhone 4S from Sprint?

I have a 16GB iPhone 4S from sprint and I could've sworn there was like a SIM card or something that would give me more storage for my stuff. Is there and if so, how without getting a higher GB phone?

SIM card and storage card are not the same. The memory of the iPhone can't be altered or extended.

On iphone you can't upgrade your storage space with a memory card (most of the phones don't allow you to do it). Phones like "samsung galaxy note 2" allow you to add more storage space with a memory card.

sim card is different from a memory card.a memory card allows you to add more GB (storage). A Sim card is the card that allow you to connect to your carrier network.