I used to work for a boss who occasionally took the whole office to a nice lunch at a restaurant. At one of these outings, one of the little ninnies in the office spent the entire meal playing around on her phone. It seemed like the most blatantly rude thing I’d ever seen.
People cling to their electronic leashes like a junkie does to their stash. If it is out of reach for even a moment they get antsy.
Ask them to put it down for 15 minutes and they began to desperately watch the clock waiting for the time to be up.