If a phone is harmful mainly when it's misused, why ban the phone instead of teaching limits? My opponent is right that endless games and videos can hurt studying. But their own list includes search, quizzes, and video lessons, which shows the tool isn't the problem. A 19-year-old working a night shift or commuting to college may need a phone for schedules, banking, and emergencies. That's why a blanket under-20 ban is an arbitrary cutoff, not a practical rule. It would be widely ignored and punish responsible older teens for younger kids' screen habits.