How to manage the problem of college students sending short messages by mobile phone in class!

This is really difficult to manage! You have policies and students have countermeasures! The teacher gave a wonderful lecture! Students who send text messages will definitely not be malicious! Your class is not very exciting or they are not interested in your class! Even if you put away all your mobile phones, it won't have any good effect. Try to insert some entertainment activities in the classroom to adjust the enthusiasm of students! Teachers will get used to this problem gradually ... I hope you succeed!