iPhone 12 pro max

Kz2021 wrote:

Im sorry but thats not very helpful,

You didn't tell us you are leaving the phone call page during a phone call. I'm not a mind reader.

Do you see the green icon in upper left corner? Tap it to return to the phone call screen, then tap the red hang up button.

You can also tap the power button when you are on a phone call and you will end the call.

See this photo:

This is the screen you should see when you are on a phone call.

Tap the red button, which is the hang up the call button.