Who to repair mobile in it water

@sugambral we could not answer that since we a. do not know where you are and b. we do not provide that type of advice. It is never objective to tell you where you should go to get it repaired. It will always be subjective based on other peoples experience. That can lead to a lot of spamming and might be very disappointing to you.

Of course there are a few exception to that. We do recommend the techs that can do this, if they are known to the iFixit community as honest, trustworthy and capable. Here we try to empower you to fix your own device.

Now, if you wanted to give this a try then the very first step I would take, is to disassemble your phone. Use something like this videoTake a close look at all components and connectors, assess the damage. Look for major corrosion, evaluate the pins in the connectors etc,. Take a look at all connectors as well as cable ends. You will have to remove all the EMI shields. If you do not remove the shields, you are not cleaning the board. Once you got the gross contamination cleaned, use 90%+ isopropyl alcohol and clean your parts some more. For a proper cleaning, use this guide. It was written for an Apple iPhone 3G but it is still pertinent to your phone as well. I can not stress the importance of a good cleaning enough, so do it over and over while replacing the alcohol after each cleaning. The importance here is the cleaning. It would of course be best to get it professionally cleaned Do not forget to replace the battery. This is a must and not an option. It will fail if you do not take care of it now. After that, reassemble your phone and re-evaluate. For as long as you have not cleaned your board and replaced the battery, everything is just a guess. Keep in mind that water damage is the hardest to troubleshoot and to repair. It does not matter if is was exposed for 2 seconds or 2 hours, what matters is where the water (particulates) did the damage.