Phone drop in water now not opening

@sambhavjain you will have to treat it the same way as you would any other fluid immersed device.

First you want to stop continuing to try to charge, sync or otherwise use your phone. This potentially can make a bad situation worse.This may further damage your phone.

The next thing to do is to clean it. Disassemble your phone using something like this video as your guide. You must remove all EMI shields from the circutboards. If you do not remove those, you might as well not do anything. After you remove those, clean the complete boards (charging board and motherboard), connectors and all with +90% isopropyl alcohol. Follow this guide, and even so it was written for an apple iPhone 3G, all the points are still pertinent to your phone as well. While you clean your boards, 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. Best thing to do, would be to clean it with an ultrasonic cleaner, but if you do not have access to one, this will at least help. Once all this is done, reassemble your phone and reevaluate. Until it is cleaned, everything will only be a guess. Always remember that even with all this, water damage has only a small chance to be fully repaired, but at least you can give it a try..

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.