Don't know why, but my screen was blank this morning. Took the battery out for about 15 minutes, and now the screen is on. Hope this isn't going to be a regular occurrence . . . . my phone is pretty new
I saw this on another forum. I was having problems with the blank or black screen during a phone call but the normal screen would not come back as it should. First thing I saw that I tried was to wipe/clean off the screen where the Proximity Sensor was located(that is is just below the left side of the speaker/ear). The other thing suggested which fixed it entirely is an app on Google Play by ZTE. It is called Proximity Sensor Calibration. https://play.google.com/store/apps/details?id=cn.zte.ProximeitySensorClib&hl=en
AWESOME. My phone was going nuts when I was on a call - screen would turn on & off, would go off when away from my ear and on when near it. Ridiculous. In 2 minutes, this app appears to have solved all of that. THANKS!