I have an iPhone 7 Plus. When I am on a call and I try to open another applicaiton (e.g. messgaes, mail, maps), half the screen is black. This happens both in portrait and landscape mode. It also happens when the display zoom is set to either standard or zoomed. I've reset and power cycled the phone. I've closed all the back ground apps etc.
Any ideas before I downgrade back to 11.0.1?