In all of the places named above, people have interrupted me more than once a day, and I don't think that's abnormal. And again, it's much easier and less rude to put my phone on silent for unknown numbers, than it is to ignore a coworker/friend/neighbor/partner/child who's trying to get my attention, or even a stranger at my door.
I'm not here defending spam calls. They are annoying AF.
Nor do I disagree that hypothetically more people on Earth have access to us than ever before. Of course they do.
Nor do I find being interrupted pleasant. I personally find it very annoying, even when it's a loved one.
I'm just making the point that this idea of world where people weren't easy to interrupt never existed.