Comcast/Xfinity, of all companies, actually has a reasonably good, network-based capability, "Spam Blocker": <https://www.xfinity.com/support/articles/spam-blocker-overvi...>

I discussed it yesterday in another thread:

<https://news.ycombinator.com/item?id=49126133>

I suspect that the relevant factor is that Comcast doesn't provide significant outbound business telephony relative to its household business, though that is one of their business offerings, see: <https://business.comcast.com/>.

(I may be entirely wrong on this, I'm just learning much of this in the past few days/weeks.)

No doubt. Before they went bust (and this is aging myself), I worked for a web design company - we had a guy who brought us a bunch of business, and never met a get-rich-quick scheme too problematic. He had the "bright idea" of what was basically pyramid scheme spam - people got paid to import their address book or manually add all their friends and so on. We did not work on this project. He regaled us with the woes of finding hosting, as no-one wanted to touch it as soon as they translated his bullshit trying to legitimize it - except GlobalCrossing, who was happy to host it for a "surcharge" atop their usual rates.

New Zealand is amongst the countries which fare pretty well, averaging about 1 spam call/month. Rates vary considerably worldwide, Brazil peaks at 29. And within countries rates vary considerably by individual, with some people reporting virtually no calls, others many per day. As with much else in technology and mass communications, individual experience vary hugely.

See my earlier comment: <https://news.ycombinator.com/item?id=49131195>.

Citing "Robocalls: A Worldwide or US-only Problem? Analyzing Spam and Fraud in International Phone Calls" (30 Jun 2026) <https://arxiv.org/html/2606.31790> and a Hiya report <https://work.hiya.com/hubfs/2025/Global%20Call%20Threat%20Re...> (PDF).