Dropped iPhone 4s in water?

First of all, it started floating (case less) backside up. I it out quickly, dried it, and it appears to be working fine, charging included. There's only a slight scratch on the top. When I call people they say my voice is blurry. Anything to look out for/check?

Backup iPhone 5s in Lost Mode?

I recently bought a iPhone 5s which turned up being in lost mode, I was told there isn't a way to reset the phone but what if I were to use my backup from my iPhone 6 on the locked 5s, would it work? And if not is there any software I can use to bypass the lost mode?