How to activate this iphone?

I recently found this iphone 4s and i'm wanting to activate it with my current carrier.problem: there's no sim card in this phone and i can't just use the one out of my phone because i have a samsung epic (I) that doesn't use a sim card. My current carrier is sprint so i don't know if i need to buy a new sim card or get a new one from the sprint store? Someone please help me out…

Added (1). When i said i "found it," i meant i stumbled upon a great deal on ebay, so i took it. Get your facts straight before you lecture.plus, i already said it had no sim card. You suppose someone lost a brand new phone with no sim card? And how would i even get that back?

No sprint doesn't use sim cards, on att does.
if your in PA i have a sprint iphone 4s i'm selling but will trade for a att 4s.email me

How about you give the iPhone back to its owner because I'm sure they have reported it lost or stolen and it'll be useless if it's black listed. Just because you "found it" doesn't mean you own it

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