As a kid my barber didn't have a phone. He figured if he was on the phone he wasn't servicing his customers so he never had one installed (he retired just a cell phone came down to where normal people could afford to use them for voice calls). A couple times a his family did call the bar across the street and the waitress would walk over and relay the message (he probably closed shop for the day every time that happened).

Telephones are useful for a lot of things, but they are not quite as critical as you think.