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Sorry to hear this but 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/
Had my Xperia Z2 for 2 months. I had a screen protector on it. The screen broke, when I went outside for a walk. I heard a crack and took out my phone out of my jackets pocket, the screen had 1 crack, then I heard another one and saw another crack, but a bit shorter, then there was 2 more but a bit longer. The screen doesnt respond. Im really upset right now, becouse I have no backup phone.. 
Sorry for my English, I am french ...
I'm so happy to join you in the cracked crew ! My phone decide to broke it screen itself like many people in this topic. I can see that it's a big problem who touch everybody... I have buy a Z1 for my girlfriend for Chrismas and I hope that it couldn't break...
I precise that i'm very carefull with all my phones and I never broke any phone in my all life ! My Z2 never fall down and have screen protectors in the two sides and the official sony protection.
I have the "chance" to haven't my screen broken in the full screen but just in a corner where isn't on the touch-screen.
What about the water on my phone now ?
I'm sorry but I read only ten pages of this topic and not the 22, but does sony accept the reality and fix our phones ? Or are we fu**ed by the compagny ?
If I don't see any commercial gesture for Sony, I swear it's over. Like many people, I would go back to Samsung's plastic.
Hi kavia.....i'm sorry but there is nothing we can say or do here about your complaint, the forum is run by users to help other users........you will just have to go back & speak to the Xperia Care Centre you have been dealing with...sorry 
@angelaneill wrote:
Maybe the glass heats when in use and expands then cracks under pressure of the metal casing. I'm sure it would have to be tight for waterproofing??? Just my opinion
Hi, sorry to hear this......for the waterproofness the glass is not 'tight' against the frame, there is a gap to allow expansion for heat/cold, i'm afraid all you can do is either take it back to your place of purchase or contact your Local Xperia Care Centre 
The only other option is getting a 3rd party repair......or find someone you know who is confident enough to do it for you, back glass is fairly cheap from various sites also there are numerous 'step by step' videos on how to do it, this will however void your Sony Warranty if you have to send it in for repair sometime in the future & they realise it has had work done, also it does put into question the waterproofness if carried out by someone else 
Whatever course you take...good luck :smileysmileywink: