Here’s a little bit more Bell System history for you.
“Challenge of Change”, from 1961. I think this is noteworthy as a very early depiction of the first modem (among other things). That punch-card dialing system is pretty neat for 1961, too.
Bonus video #1: This goes out to all the radio people and “Mannix” fans out there: “Mobile Telephones”, or: what cell phone technology looked like in the late 1940s. Show this to your children.
Bonus video #2: “The Far Sound”, a Bell Labs history of the development of long distance service.