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Get an ear tip and clean the 3.5 mm input.Let the phone dry and check again.
You might need to visit a sony service:
http://www.sonymobile.com/global-en/support/contact-us/
There should be a water indicator at the usb lids,see if they turned red or pink.
I thought it has water indicators if you open the flaps for sd,charging etc.can't you find any indicators?
If water entered your device,it might be just broken.You have to visit a service,have the phone tested.