Answer to "Moto 4Gplay screen goes black when dialing or receiving call."I changed my screen and soon after the screen would go black during calls. I noticed, at the top of the screen, it had started to lift very slightly. I pressed the top of the screen back into place and the fault stopped. It reappeared a couple days later when it started to lift again. I have since made permanent repair now and its fine. Hope that helps some.