Iphone dropped into a lake in April.... still working!!

Back in April of 2012 my iphone was dropped from a dock into a lake. It fell into around 6 feet of water. Due to the way the lake level's are maintained it was out of the water this weekend. I picked it up and cleaned it a touch. Believe it or not, the darn thing turns on when you plug it in. The screen is a little fudged up and it won't hold a charge or connect to the computer, but the damn thing turns on. It was underwater for almost 6 months. Any ideas what I should do with it? The touchscreen works fine. No sound though....