We enforce that rule whenever we have guests (typically, family members). Obviously it doesn't need enforcing otherwise, as neither of us has a smart phone. Wh

We enforce that rule whenever we have guests (typically, family members). Obviously it doesn't need enforcing otherwise, as neither of us has a smart phone. What's interesting is the defensiveness people express when they are are called up on a social behaviour which would be completely unacceptable and weird a few years ago.