When I was in grad school I went out to some bar with five undergrads. We sat down and they immediately got out their phones and were on it the whole time. I got up, went to the bar, and made friends with the people there. I'm not even sure the undergrads realized I'd left. What's the point of going out to be on your phone when you could just as well do that at home? Phones also ruin good bar conversation. You know, especially when you talk about sports and you start to argue about who was the best or who had what stats, and it can be pretty entertaining as people remember names and numbers. But now somebody just whips out their phone, looks it all up, and that's the end of the conversation. With people who I hang out with who have a severe cell phone addiction, I make them play cell phone roulette. Everyone's phones in the middle of the table. First person to pick up their phone buys the drinks/food/whatever.