Fair enough that unrestricted phones can hurt focus and grades, and my opponent's concern is real. But those studies usually compare heavy, unsupervised phone use with little or no use, not a clear classroom policy. My strongest point is that the choice isn't ban versus free-for-all. Schools can allow phones with strict limits: used for a task, then face-down, with consequences for breaking rules. That keeps the focus the other side wants while still letting students use phones for translation, accessibility, or contacting home. Structured access is the sensible middle.