And worked pretty well[0] for the seven or so glorious years we had it in the United States before the Bush FCC ended it.

0 - Yes, I know, it wasn't perfect or even "great" most of the time but that was largely because the incumbent carriers dragging their feet on doing literally anything and the FCC not enforcing the competition rules. And when, largely out of spite, the copper-based incumbents simply didn't do anything to upgrade their networks while the not-at-all-regulated cable companies blew past them in speed and reliability, people switched in droves which gave the incumbent phone companies even more reason to throw up their hands and say "not worth it."