Technology has playing significant role in the life of each and every individual. Once up on a time educational institutions were safe place for the students. Now a day misuse of technology has creating unhealthy environment for better learning in the educational institutions. Such kind of unhealthy learning environment affects adversely on the achievement of boy and girl students. The most common victims of harassment through technology are the adolescent girls. Adolescent girls face harassment in a different ways. Mobile is the technology which is cheaply available in the market and plays prominent role in the harassment of adolescent girls. The survey research method was adopted for this research work. The incidental sampling method was used to select 70 adolescent girls for this study. The result of this study indicated that mobile used for the purpose of harassment of adolescent girl students which ultimately affect the mental health.