How to terminate a call when the red hang-up button is not avaiable.

Hi Bob1177,

It sounds like you're having some issues ending calls as the button is not appearing on your device.

If you are having issues using apps and switching back and forth to your call while either on a phone call or FaceTime call on your iPhone, you may find the information and steps outlined in the following articles helpful:

While on a call on iPhone - Apple Support

Use other apps during a FaceTime call on iPhone - Apple Support

Cheers!

To get back to the phone screen tap the green button behind the time on an iPhone X or later, or the green bar at the top of the screen on other models.