People stopped 'picking up', and hanging up,. when old fashioned phones went out of fashion years ago.
I still 'answer' the phone mind. That's as long as it's a recognised number, if not I leave it and they can leave a voicemail if it's genuine.
Did you know that the word 'hello' was originally used as term to express surprise. 'Sunderland have just signed a new £10 million striker!' 'Hello!?'. It wasnt until the invention of the telephone when it become widely used as a greeting.