For years, manners have been defined and documented in easy-to-learn rules classed by geography and culture. For example, in some countries it’s acceptable to make abundant noises when eating, whereas in others, eating is a matter to be taken with the utmost seriousness and is performed in stony silence. Then along came the jangling cellphone — a very loud ringtone and voice in the dining room, and an unaddressed problem generally ignored. Until now, possibly.
