My iphone 4 has colored lines covering the whole screen

I dropped my phone in the river a couple of weeks ago, it was in for about 2 minutes and the now all thats wrong with it is the lock button as it doesmt work at all. I went to go on snapchat and my phone froze for about a minute then a load of coloured lines appeared on the screen and i can't turn it on or off and i don't know what to do! Someone help me!

Your phones got water damage (Hence that iOS 7 gag about being waterproof is fake)
Sadly you'll have to buy a new phone, it's not going to work anymore.

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