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As hundreds of people have have found out, some Xperia phone displays have a peculiar ability of cracking on their own.
I want to know if Sony mobile take responsibilty for this issue and replace the displays free of charge, given the device is under warranty.
This is a user based forum, you should contact Sony directly
http://support.sonymobile.com/global-en/contactUs/
A screen can't self crack, there has to be a force exerted on it for it to crack.
But,this is nnot only a self user related issue.There are so many owners which have self cracked screen sony users like me.