This document discusses some negative effects of mobile phone use, including wasting time on gaming, music, and messaging which impacts students' studies. Prolonged mobile use can also strain eyes in dim light and mobile phones have been implicated in some major crimes. The document further discusses potential health effects of radiation from mobile phones such as increased absorption by the human head. It notes mobile phones may affect the blood-brain barrier and could present a cancer risk. However, studies suggest mobile radiation does not normally affect heart rhythm but may interfere with implanted devices like pacemakers.