How to disable the find my iphone app on an iphone 5 that i found?

I found an iphone 5 and I noticed that it didn't have a lock on it. I turned it off only to later realize that the phone was locked with a password and the only other option was to call a number. I want to know if there's any way to unlock the phone or delete the app.

Dude.ring the number.give it back.youll never forgive yourself. Then when it happens to you.youll know how it feels to loose an iphone 5.grow some tennis balls.give it back