Write essays with topic" should cellphones be disallowed in classroom"?

The society is growing and more modern. People also have access to modern technology equipment earlier, especially children. Mobile phones are the most popular means of communication and entertainment today. With these convenient and attractive functions, almost all students use their phones almost every day to text, Facebook, listen to music, watch movies ... Many students also use mobile phones while studying in class Do not pay attention to listening to lectures, teachers just pay attention to the phone screen, lose knowledge, do not understand the lesson. Disturbing with classmates and teachers. Phones can also be addictive, crazy if you don't have a phone in your hand. Using a mobile phone more easily leads to depression and autism. So, don't let your phone ruin your future!

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These days, using mobile phone among students is very popular. Cell phones are always brought to the class by the student. In my opinion, cellphones should be banned in classrooms.
Firstly, cell phones will prevent students from concentrating on studying. When using phones in classroom, they will not listen to teachers and skip important lessons. They may play games and text messages instead of learning. Hence, they cannot acquire knowledge and fail exams easily. Moreover, teachers can be interrupted because of the sound from students' mobile phones and they cannot teach their lectures effectively.
Secondly, students can cheat when having exams if they use cellphones in classrooms. They can use their phones to search the result of a test or they can call for help from their friends or their relatives. They can copy by using phones, they may store all the lessons in their phones and use while taking an exam.
To sum up, although cellphones have many advantages, it will be good for students not to use cellphones in classrooms.