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If you haven't a landline, then you are not really familiar with the problems of robocalls.
In our household we have two cellular telephones (one AT&T, one Verizon), two VoIP lines (one Spectrum, one Vonage), and the legacy landline which my father had installed in August of 1961.
The cell phones and VoIP lines all use NOMOROBO technology, and have minimal problems with unwanted calls, perhaps one call per day.
The landline (which my father refuses to have disconnected in case one of his old friends, most of whom have passed on, tries to call him) received between twenty and thirty robocalls every day, despite being on the DNC list.
During the election season the number was closer to forty calls per day.
Most cell phone carriers (more or less) effectively protect their subscribers from this annoyance, or at least make a game attempt.
Not so for the providers of copper land line service.
Copper landlines are essentilly the lines that provide service to our very rural parts of the US. These are places often without other service- be it cell service, cable (including internet), etc. Essentially in these areas it is copper landlines or nothing. It is not profitable to update these lines to fiber... too few customers.
When Ma Bell was broken up in 1984, AT&T in particular got stuck with a lot of aging infrastructure. By aging, some of these lines date back to the 1950s, some before. The Bell System operated as a legal monopoly to provide service to these types of rural places... places where there is no competition because of lack of customers. They are a cost sink. A cost sink that at the time of MA Bell was acceptable because, monopoly.
When issues such as providing "universal broadband access" come up, these telecomm companies normally come up to the table with a "proposal" to provide such services, if (and only if), they can drop 2% of their customers on aging copper lines.
And noting that many of these places lack alternative communication services, this leaves them with zero communication avenues for EMS or business services. These aren't just rural areas that have only whittlers either, but are heavily agrictural or forested. A lot of our food comes from these areas. Maybe not such a good idea to keep them from selling it to us.
Thank you both. That all makes sense.
My one thought as followup is that even on the cell network, the "you've stayed at one of our resorts in the past" call (I assure you I haven't) is making its way through the cell defenses several times a week and this has been going on for well over a year.
That tells me that either the company behind the call is very good at breaking through the network's defenses or the cell network (Verizon, in my case) cut a deal with them to let them through. Cynical - yes, but I wouldn't bet against it.