Back in the twentieth century, we studied etiquette. My seconndgrade class came equipped with plastic telephones, and we rehearsed telephone manners. With one child sitting at each end of the table, and the entire class watching, we took turns making and receiving calls: “Hello.” “Hello. This is Mrs. Smith. May I please speak to your mother?” “I’m sorry, she’s not here right now. May I take a message?” “Yes. Please ask her to call me back.” “May I please have your number?” “Yes. It’s 212-999-9999...