Many educational experts believe that smartphone use has two sides, especially in the era of information technology development. If ban is a step backward, backward in the era of technology 4.0. However, how to manage it, not "cannot manage it is prohibited". Not to mention, there are general variables when using smartphones like some teachers for fear of burning lesson plans, requiring students to take photos of the lecture and go home to learn by themselves.

Students can use the phone for study purposes, find information faster and more accurately. Students use their phones in combination with learning purposes, which will help them save time and improve their knowledge. but it is not always possible for them to use the phone because it would not be good for them firstly that their eyes, the students will be dependent on the phone it. The phone will also keep them focused on virtual things, making them only live in a world that does not exist but forget society. Besides the advantages there are still many limitations of student use of the phone. when going out or after school, it is easy to catch students staring at their mobile phones; or on the way to school, it will not be difficult to see the image of a student driving a bicycle while listening to music on a phone with a headset. That is not to mention many cases of using mobile phones to play games, using popular social networks such as Facebook, Zalo, Instagram ... anytime, anywhere. Students can use a mobile phone but need it with proper purpose, forming a sense of self-awareness when using a mobile phone, without affecting health, psychology and learning.