This is an early and important example of #PredatoryInclusion: the monopoly carriers delivered universal service to all of us, but that was a prelude to an ugly. parasitic, rent-seeking way of doing business:
https://lpeproject.org/blog/predatory-inclusion-a-long-view-of-the-race-for-profit/
It wasn't just the phone that came with an unlimited price-tag: everything you did with the phone was also a la carte, like the bananas-high long-distance charges, or even per-minute charges for *local* calls.
6/
Features like #CallWaiting were monetized through recurring monthly charges, too.
Remember when #CallerID came in and you had to pay $2.50/month to find out who was calling you before you answered the phone? That's a pure Bellhead play. If we applied this principle to the internet, then you'd have to pay $2.50/month to see the "from" line on an email before you opened it.
7/