Opinion: We need to ban or limit smartphone use in schools

It’s 8:30 a.m. and I’m standing in front of a sea of teenagers huddled at their desks, their heads uniformly turned downward, the blue light of their smartphones illuminating their faces.
For a moment, I feel like I’m living an episode of Black Mirror, a satirical Netflix series that takes place in the near future and provides an exaggerated take on the dangers of modern technology, including smartphones and social media.
But I’m not an actor in a sci-fi series.