When it comes to banning cellphones in schools, success could be determined by the details.

Do bans apply only to classrooms, or also to hallways, bathrooms and cafeterias, where students are much more likely to be absorbed in TikTok or text messages?

Do teachers have the freedom to override bans if phones are being used as part of a lesson? Should school districts purchase devices to lock or hide phones? What about distractions from other types of screens — laptops, tablets and smart…