How to fix iphone 4 water damage?

I ended up dropping my phone 4 in water and did some research and I'm assuming its corrosion but I'm not sure. I tried changing the battery and I've had my phone in rice for days but all that's happened is the camera flash light has turned on. I do not want to have to get another phone, any ideas would be appreciated, thanks.

You've opened it up and replaced the battery, you have totally voided the warranty and Apple will not touch it. On top of the liquid exposure looks like you're forced to buy another phone.

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