Nexus 6 screen goes black during call (w/ Lollipop 5.1) After updating to Lollipop 5.1, any phone calls made turns the screen off. I cannot get the phone to bring up the screen to end the call, dial another person, or interact with the screen in any way.
This is a known problem with the current Android 5.1 update and screen protectors. The problem is related to screen protectors affecting proximity sensing that normally turns off the screen when it is close to your face. There are a couple of solutions:


Remove the screen protector
Set the Power Button Ends Call setting under Settings > Accessibility.