If ever I go out for dinner or coffee with friends, my family or even work, there is only one rule. Phones are on the table and they are off. If anyone`s phone makes so much as a squeak, that person pays the bill for everyone.
When we started it, you could keep your phone on and if you answered it, or replied to a txt, or FB post, you got the bill but some of my sneaky nephews and nieces put their phones on vibrate and kept running off to to the toilets to answer them.
So we upped the ante, all phones off, no exceptions. Some of my younger family members initially suffered FBSA (FaceBook Separation Anxiety) but they have gradually learned that it is not the end of the world to switch the phone off for a couple of hours and have some real time interaction with your family or friends.