My sense is that a phone call itself isn't rude, per se, just an unexpected phone call with the caller's expectation that one will drop everything to take it?
It is very interesting to me how communication patterns have evolved with technology. I almost never call anyone without texting them first, expect my kids and my sister. I almost never answer a call unless I'm expecting it, except for my kids and husband which I always pick up unless I'm already on a call or work Zoom.
If I ever occasionally spontaneously call out, I am more surprised if someone answers than not. I figure, if they pick up they made that choice!
I do love a long, pre-arranged chat, especially with equally busy friends, while we are both walking. Multi-tasking at its best. I also like to talk while I'm driving -more multitasking (yes, hands free!).
What I really dislike are voicemail messages. Send me a text or even a voice text but don't make me have to go into voicemail. With the recent advent of voice texting, I am using this much more often for that spontaneous hello. Don't know why it's such an annoyance to me.
Janet - laughing about the basement steps memory! I did the same thing with our only phone in the house. Amazing that cord didn't get pulled out of its socket over the years. We were only allowed to use the phone for 10 minutes at a time, though, "in case someone was trying to call". Remember busy signals? So annoying! In retrospect it wasn't a bad rule, but I wanted to talk for hours when I was a teenager and I loathed the 10-minute-rule.