I do feel for the girl in this article for whom it was used as a coping mechanism for bullying. No policy comes with zero downsides
Right, it's kind of a trolley problem. Is it better to do lesser harm through action (banning cell phones, meaning a few students like this can't reach their family during school hours), or greater harm through inaction (loose cell phone policy, harming the learning process for everyone, inviting violence against teachers who are competing against addictive algorithms for their students' attention)?
Cell phones barely existed when I was in school and were certainly out of reach for students. Bullying still happened (personal experience, yay) and staff would shut that shit down when they saw it or it was reported.