Yes. The default state appears to be primary (maybe even sole) interaction via phone. That's not to say that they're not showing each other stuff, but it's phone-to-phone - as in, sending each other social media messages, not passing a physical device back and forth.

I'm not quite so exercised about it as most people seem to be - the historically universal assumption about "the youth" is that everything they do differently is terrible, which has not typically turned out to be the case. As a (former, for now) teacher, however, the distraction-potential for / from phones is extreme. That goes for in-class, out-of-class, at-home, everywhere. I'm in favor of banning them entirely in schools, and (as a parent, who's still a few years away from facing it with my kid) limiting access at home.

Personal anecdote: my time teaching middle-school kids coincided with the brief pre-smartphone era in which they taught themselves to T9 with perfect fluency, without looking at the screen. The first few times I saw that I was so flabbergasted I couldn't even get mad. I don't know the exact age-range of that group, but it was a very precise demographic slice. I still tip my cap to those of you who learned that trick.