Teachers and other staff have also been asked to avoid using mobile phones in places like classrooms, playgrounds, laboratories and libraries where teaching and learning activities take place.
source https://timesofindia.indiatimes.com/city/delhi/delhi-school-students-not-allowed-to-use-mobiles-in-classrooms-doe/articleshow/102618960.cms
source https://timesofindia.indiatimes.com/city/delhi/delhi-school-students-not-allowed-to-use-mobiles-in-classrooms-doe/articleshow/102618960.cms