Phones in school impair learning. The results from a large randomized controlled trial involving 16,683 students across 10 higher education institutions found that phone bans improve students’ academic achievement, with particularly pronounced benefits for low-performing students. The effect size of removing phones was about one third as big as the effect of changing from an average teacher a very good teacher for an entire academic year. Students who experienced the in-class phone bans also became significantly more supportive of such restrictions and perceived them as beneficial. science.org/doi/10.1126/scie…