When I tried to dismiss a notification on the lock screen of my iPhone XR, a white frame appeared around the time and date. If I touch the flashlight or camera icons on the lock screen, the frame moves there. I tried turning my phone off and back on, which didn't help. I'm unable to get to the home screen, and the phone will not turn off, now. I can't access my calendar, email, texts, or anything else. Any ideas?