I have a feeling that bans are not the most effective approach long term. Maybe there's a solution where we educate young people on responsible phone use and work with them to design practices that work for everyone. After all, outside of high school people have to actually self regulate their phone use. Whether they do so effectively varies, but maybe it's a skill we need to think about teaching and developing. Just a direction I've been thinking in, I don't have any concrete recommendations.
Of course schools are already way overburdened, but maybe a solution here has large enough positive externalities to be worth it.