i'd never! with me it actually started already long before mobile phones existed, when i noticed that people who call an office, a reception or such get priority attention to someone making the effort & turning up in person; it used to piss me off no end. most of the times you would have been waiting physically in line, only to have a telephone call barge in the moment it's your turn. some are more equal than others.
The saddest instance I ever saw of this was several parents phubbing their young children at a work-related children's Christmas party. Child: "Mom, Mom! (or Dad, Dad)! Look what Santa gave me!" Parent: dismissive grunting noise without even looking up. Some of the children might as well have been at the party alone.
I also like the related word "smombie" = smartphone zombie.