Phone calls still assume the people on the receiving end are attached to a desk.
Why couldn't this call be an email? Why would you call, when you know that you are near indistinguishable from spam calls about Microsoft services and Nigerian princes?
I remember a very rude university lecturer called me once when I was in Tesco. He told me to turn off the Tesco self checkout because of background noise. I was in the middle of buying my groceries. Wut.
He also called me a "fucking asshole" as well which wasn't very pleasant. Basically he made an appointment for me to come to see him, notification of it was sent in the post as a footnote of a larger letter which didn't arrive until 2 days after.