There is a bizarre consequence that you have to remember all the phone numbers you want to dial or keep a paper contact book with you as well.

Relatedly, how many of you remember a bunch of phone numbers from your childhood. I can recite my best friend's home phone number, my home phone number from childhood, my dad's old office number, and my mom's cell number - despite all but 1 of those numbers having not been valid for 16 years.

Yet ask me to recite any phone number from when I got a cell phone onwards and I only know my own cell number and my wife's because I have to give them to other people or fill them into forms.

I wonder if these childhood phone numbers will continue to be retained / recitable when I'm much older.