Y'all know we used to publish everybody's phone number in a book along with their address and then distribute copies to every household, right? We did it for many decades and it was fine. Every pay phone, which was a phone anyone with a couple coins could make anonymous calls from, had this giant book right there for your reference. Everyone knows this, right? If you didn't know someone's number you could look it up…
Could I easily look up a name for a given phone number with this book? Or did I have to go through the whole book to find a match?
In old movies you sometimes see people ask the operator to do a reverse search as well so I assume it wasn't a big deal.