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Hi, is every other function of the phone working perfectly as in screen, camera etc...:smileyhappy:
You need to either return your device to the place of purchase or contact Xperia care http://www.sonymobile.com/global-en/support/contact-us/
Hi, if all the other functions like scrolling on the screen, taking pictures etc are all working perfectly i would rule out water damage, so you may have damaged something when it was dropped as i presume it hit the bottom of the bath 