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I'm sorry to hear that. This is controlled by a sensor located at the top of your screen, if the sensor works as intended then the display will be disabled when covered during a call.
You can test this sensor outside of calls by going to: Settings > About phone > Diagnostics > Test > Ear proximity. How does the sensor behave in this test? Does the phone start vibrating directly when starting the test?
I would also recommend that you try and perform the same test with your phone rebooted to safe mode. This is to make sure that none of your downloaded apps are causing this behavior.
Let me know how it goes!
I see. Are you experiencing the same behaviour with the display turning black during calls with your phone rebooted to safe mode? If that is the case and the phone passes the Ear proximity test I would advise you to repair the software in your phone. That way we can rule out this being software related or not. This is done using a computer and our program Xperia Companion, available for both Windows and Mac.
Click the following link for instructions on how to repair the software: https://talk.sonymobile.com/t5/FAQ/How-to-perform-
Note that this will reset the phone, you can create a backup directly in Xperia Companion using the Backup feature.
I would however advise that you try making and receiving a call before restoring a backup after the repair is complete.
Should you still experience this after a software repair, let me know!
I see, I'm sorry it had to come to that but if a software repair didn't help with getting this resolved my guess is that this is related to hardware rather than software.
Keep me updated!
The service centres will first have to examine your device before they can determine what components need to be replaced/repaired.
However, I'm not sure about how the warranty and service procedures work in the market you are based in. I would advise you to contact either your local support team, your retailer or the service centre directly for more information about this.