Those of us who are addicted to our smartphones often do things we know we shouldn’t do, such as checking our phones during dinner. The Wall Street Journal’s Jason Gay has put together a handy list of 21 dos and don’ts for smartphone dinner tablet etiquette, and while not all of his suggestions will be adopted as cultural mores, some of them are definitely worth heeding. The best suggestion in Gay’s list is to just have everyone put their smartphones face down on the dinner table as a default setting before eating dinner. There are exceptions to this, of course: A mother who’s out on the town and has left her child at home with a babysitter should be allowed