Phone-free all day is a productivity move, not a moral sermon. Phillipson's 26 January 2026 letter pushes the same idea as the government guidance: phones should stay out of use from first bell to last, even at lunch. When you remove the device, you remove the micro-bargaining that eats lessons, detentions, and goodwill. Give parents one channel through the office and the classroom stops being a customer service desk.