A large study on school cell phone bans has found mixed results. Teachers report fewer distractions when students lock phones away, but there's little evidence of improved academic achievement or behavior. The study involved data from about 4,600 schools and was published by the National Bureau of Economic Research. It shows that phone usage drops significantly with bans, but discipline issues initially rise before improving. Academic gains are minimal, and attendance and bullying remain largely unaffected. Researchers suggest the bans reduce phone use, which could eventually enhance learning. They emphasize patience and persistence in managing digital devices in schools.