My Grandmother lived about fifty miles away from us. One year she had surgery on her arthritic knees and used a walker while recuperating after the surgery.
My mother bought her a cordless phone so she would be able to keep the phone with her to answer calls without having her get up. Cordless phones were a kind of new fangled convenience at the time.
One day grandmother called and she and mom talked for quite a while.
“Well mother, we’d better hang up since we’re talking on your nickel.”
“Oh that’s OK Joyce, I’m using the cordless phone.”