Distraction spreads like an infection: one screen lights up, and half a row catches it. The strengthened guidance asks for a phone-free environment by default, including social times, because contagion loves the gaps. If teachers must fight the same battle every lesson, morale drops, sanctions escalate, and learning becomes collateral damage. Remove the carrier, and the classroom gets quieter without a speech about values. Pair the ban with a clear storage system and predictable retrieval at the end of day, so the policy is procedural, not personal. You don't need purity, you need consistency.