First, the quality of Vietnamese students, the economy, and other infrastructure conditions across the country are not equal. In many places, students have weak academic capacity, the class size is usually quite large (45-48 students, except for specialized schools about 39 or less). Therefore, controlling students and guiding them to look up knowledge by phone will face many difficulties and shortcomings. Certainly there will be many negative situations such as: students shoot and post offensive videos in class, teachers and students are always in a state of refinement to avoid being "exploited", while content and the practical quality of teaching is still nothing better.

In my opinion, students are not allowed to use cell phones in class, because it is difficult for teachers to control the students.Use the phone for study or to do other things, because a teacher cannot control all the students in the class . Why not, because like that, students will lose focus on the lesson they are teaching. So the use of telephones in the classroom is not up