I think high school students use mobile phones, more harm than good. Today, more and more temptation on the phone, but resist the temptation of high school students are generally not high, resulting in cell phone becoming dependent on high school students, the ring also addictive, and even some students often stay up all night playing phone hiding in the yard, leading to the second day of class dozing. Worse to leave the phone will feel the body is not comfortable, irritability, showing great temptation of the phone. Also lead to relationships with classmates, friends, parents, alienated, and even alienation. And mobile phone radiation, affect the physical and mental health of young people, so high school students use mobile phones more harm than good. Now,we should put the phone to the time we play less and less control to ensure that our health.