Black screen during a telephone call and unable to stop the call because the screen doesn#t work

Hello, I have the following problem. I can’t stop a telephone call by myself because the screen is black. For example, when I call my mailbox: The screen is black during the telephone call and I can’t do anything during this call because the touch screen doesn’t work. I have to wait until the mailbox stops itsself the phone call. That’s very long, too long. Has anyone an idea to solve this problem?
Thanks Jürgen


That’s a problem with the proximity sensor. The sensor checks if you are holding the phone on your ear and switches off the screen to prevent false touch inputs.
Problem and workaround in this topic: