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I am not sure if warranty will cover this but contact sony to be sure:
http://www.sonymobile.com/global-en/support/contact-us/
Keep us updated.
Shashi9686, usually warranty valid if something works bad for manufacturer guilty. When you getting free repair. That's mean, that after drop your phone into water you lost warranty, coz guilty you are, so you will pay all service repair exes. I had this problem with my first Samsung mobile phone which i bought... Repair service found that phone got water and i lost warranty. It's mean that i could repair my phone, but i must pay for repair. So you can go into place where you bought phone, but i'm sure they siad the same to you, what i wrote you now: you lost warrenty and all repair exes you will pay.