Mobile Phones Should Be Banned in Lecture Halls

Nowadays,mobile phones are widely used by teenagers.This communication tool is important for us to contact with others whenever it is necessary.However,mobile phones have lead to some problems especially for college students.In lecture halls,some of the students are using mobile phones during the class.This is strongly discouraged as it may affect the students from paying full attention in the class.Furthermore,it also deteriorate the students' grade in examination.As a result,mobile phones should be banned in lecture halls.