In 2002, according to the newly revised Internal Affairs Regulations and Disciplinary Regulations of the People's Liberation Army of China, "Soldiers are not allowed to use mobile phones, pagers and other communication tools except for work needs and with the approval of the heads of units at or above the division (brigade)." "Soldiers who are approved to hold mobile phones and pagers are strictly prohibited from carrying mobile phones into war rooms, intelligence rooms, confidential rooms, communication hubs, classified places, military aircraft and ships, important warehouses, missile launching positions and other places; Working in places with wired communication tools is not allowed to handle official business with mobile phones. It is forbidden to use mobile phones and pagers to talk about and transmit confidential information. The paging desk opened by the army shall not send classified information. " This regulation is also to prevent mobile phones from revealing military secrets in a high-tech environment. I read a report that even if the phone is turned off, it can be eavesdropped by high-tech means.