Division Memorandum | REITERATION TO DEPED ORDERS NOS. 83, s. 2003, 40, s. 2012, AND 49, s. 2022 (Prohibiting Students of Elementary and Secondary Schools from Using Cellular Phones and Pagers During Class Hours, DepEd Child Protection Policy and Promotion of Professionalism in the Implementation and Delivery of Basic Education Programs and Services)