Not sure why this popped into my head but it occurred to me that when I was growing up in the 80's everyone used to pick up the phone and say their number.
I can still remember some friend numbers 30 years later as I can hear their Mum's answering the phone but I couldn't tell you my husbands mobile number now.
When did everyone stop doing this? Were we all subliminally conditioned to stop on the same day?