Share your experience!
Here's my self cracked screen. Back cracked after a moth after i bought a phone probably form temperature while it was charging, front screen few days ago don't know how i was just sitting and took already crashed phone from my pocket. I send this phone to service in Poland and they got it today, but i'm not optimistic about it 
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You can see the point of impact, on the second picture you can see where you hit the device or where the impact was made, this is not a self cracking screen.
But the problem is i didn't dropped this phone or overwheled it anywhere
Perhaps you had it in your pocket and you hit it while walking, either or, I hope your Local support is able to assist you.
I hope they will help, by now i returned to old indestructible xperia s which was the strongest phone in whole family and still is 
I agree, the Xperia S its quite a durable phone, the downside is the lack of SD card