Here (in upstate NY) Verizon runs the phone system - and they can't keep that thing running for 10 minutes it seems - if you can even get it (my appartment building is not wired for Verizon anything - phone or other). In my old place an hour away I had Verizon phone and DSL (don't get me started), that's where the phone kept going down. Cable is rock solid, and home cell service is a good backup (they even offer a home phone box that has a nice built in battery backup that can run for a few hours).
On a side note, I suspect you are deferring to "what seems to make sense" talking about "analog" phone service being simpler and easier to understand than the more complex VOIP systems, with their increased number of failure points due to the added complexity. This is insufficient thinking on a number of points, but mostly it indicates a tendency toward fundamental thinking, which can lead to all kinds of zealotry like Libertarianism, or other ideology. It's the outcome that matters, and I suspect that's different everything when it comes to phone service and other regionally deployed technologies.
There are plenty of places where the older, simpler analog systems are run by bigger dunderheads than comparatively more complex systems, and that has a much bigger impact on success and failure rates than some idea of how simple it works. Then there's the economics, the age of the equipment/industry, etc., etc.... Lot's of things matter more than what seems to make sense.