How to fix my submerged phone

Christofer Paglinawan, you will have to clean it just like any other phone. Skip the rice, it does not do anything other than give you a false sense of security. You do not want try to restart the phone. This may further damage your phone. The next thing to do is to clean it. Disassemble your phone using something like this video Then clean it with +90% isopropyl alcohol. Follow this guide, and even so it was written for a 3G all the points are still pertinent to your phone. While you clean your board, check for any obvious damage, like burned or missing components etc. When it is properly cleaned, replace the battery. All these steps are to avoid delayed failure caused by corrosion. Once all this is done, reassemble your phone and reevaluate. Hope this helps, good luck.