What should I do if the mobile phone is missing in the classroom of Nanning University?

Write a big-character poster, post it on the bulletin board or at the door of the teaching building, write a contact information, and add a "reward". Or go to the school logistics office, tell me about your situation, print your notice of finding things, and they will stick it in a conspicuous position at the entrance of the dormitory. If not, report it to the school security office.