So that you can pass them the phone while they call Granny and Grandad and they dont keep pressing the buttons and ending the call.
So that you can pass them the phone while they call Granny and Grandad and they dont keep pressing the buttons and ending the call.
This. There are ways to do this they are just fairly hidden. Because if they are not inevitably people activate them by mistake and then have a rather difficult time figuring out how to turn it off again.