From the Introduction to my Breaking Bread with the Dead, published in 2021, though these words were written probably in 2019:
Often at the beginning of a class I will give my students a brief reading quiz — unannounced in advance; yes, I’m that kind of teacher — which has the salutary effect of making sure that everyone is in class on time. The room is always full when I walk in, and fairly regularly the first thing I see is every head bowed before a glowing screen. Sometimes they don’t even look up when I say hello. Often their brows are furrowed; they may look anxious or worried. They dutifully put their phones away as soon as class begins, whether it does so with a quiz or a question, but during the discussion I occasionally see hands twitch or reach toward bags. If I see phones left on the seminar-room table I lightly (but seriously) suggest that they be put away to minimize temptation. All my students have mastered the art of packing up their bags at the end of class with one hand while checking messages with the other. They leave the room with heads once more down, and brows once more furrowed, navigating like a blind person through a familiar room.
Such behavior is noticeably less common now than it was then. My current generation of students seem far less phone-addicted. This is of course merely anecdotal, but since (despite what you often hear) the plural of anecdote is data, I offer it for your edification.