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In my Moto G 2nd gen, when a call arrives I can hear the ringtone, but the screen is black. I can't see who's calling. In order to see that I had to unlock my mobile. Is there any fix to this?
If I'm not wrong, it's because you have received an update of Lollipop 5.0.2.
To resolve this issue, go to Settings and change the priority of the "Phone" app to high priority, then go to Notification, and change way of notifying to "Interrupt for anything"