It's actually amazing what you had to convince people to do. On Youtube is a film from 1940 about how to use these newfangled dials on telephones, framed as a granddaughter teaching her grandfather because she's the only one he won't curmudgeon.
There was something of a rebellion against the Zone Improvement Plan, that using ZIP codes would somehow drain the humanity out of the country instead of, you know, making mail easier to sort.