Found an IPhone 5.is there any way of using it?

I'm currently trying to locate the owner. I live in a small town so made a Facebook status about it. If I don't find anyone, is there a way of using it? Right now it has a passcode on it. Not sure what network or how to check that.

All I know is one time I found an IPhone & no one claimed it so I just kept it so if someone wanted to claim it and the police tracked it down.

I lost my Iphone 5.

If you want to keep it, all you have to do is take the sim card out and restore it in itunes. It does not matter if there's a passcode