Re: How to send the person calling a busy signal.

Jeff Layman wrote:

Andy Burns wrote:
>

Depending on phone model, either swipe down to reject call instead of
swiping up to answer
>
Or press the red hang-up button instead of green answer button.

 Which could be an issue if your eyesight isn't good enough to read the text on the buttons and you're red-green colour-blind.

Indeed, the ageing friend may have fumbly hands, I remember people here not understanding you have to slide the button to answer calls ...