Screen does not go off during calls making it impossibe to talk
Hi. Recently I started having problems with screen of my iPhone 6S not going off during phone calls. Because of that I keep accidently pressing the "Mute" button with my cheek in the middle of the calls which is very frustrating.
The problems started about one week ago, about the same time I upgraded iOS on my iPhone to 13.6.1 (btw, is it possible to check when exactly my iOS has been upgraded)?
Anybody with similar issue or hints how to resolve it? Thanks in advance.
iPhone 6s, iOS 13