I just let the phone buzz and ignore it. What's the point of pulling it out to check? The only time it matters is if you're getting bad news, and bad news can wait. And in a meeting, I would never check it, and I am annoyed at people who do check. If I am talking to someone and they stop and look at the phone, it tells me that I am unimportant and they'd rather talk to literally anyone else in the the world including the unknown person who made the phone buzz.
Kids need to learn some basic social skills. Even nerds used to learn this stuff before smart phones. Treat the people you're talking to with respect, treat everyone in your meeting with respect, and if you don't actually respect them then keep it to yourself until you get home. And oh my god, do NOT answer your damn phone while at dinner with a friend, or worse with a date who'll never speak to you again.