This bill prohibits students from using smartphones during the school day at Department of Defense Education Activity (DODEA) schools, which serve children of military servicemembers. The Secretary of Defense must issue regulations within 30 days of the bill's enactment requiring students to store their phones in lockers or approved pouches during school hours. The regulations must include exceptions for medical needs and emergency situations. The bill does not specify funding requirements, and the implementation timeline is immediate upon passage.