"Keep mustache out of the opening": a history of phone etiquette

Not long ago I was out of town, sitting in an unfamiliar neighborhood cafe and talking with a buddy on my mobile phone. Quick as a text message, the proprietor rushed in and pointed to a sign over the door forbidding such activities in her establishment. I obediently nodded, said my goodbyes, and shut the device down. I then spent the next fifteen minutes listening to a couple at the adjacent ...