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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/
I tooked my phone to the cellphone company (telcel), and after 1 one day, they said i cracked the phone.
what pisses me off the most, is that they don't have a screen replacement.
The same has happened to me .. I'm sending mine back for repairs, however I still do not know if its covered under warranty either .. 😕
Even though it happended on its own ,, I just left it on the table and found it cracked but there was more than one :/:/:/