Here is a list of harmful effects of using a mobile phone...
Cell phone users can easily be affected by brain tumors due to the radiations emitted by cell phones. Interestingly, the risk is highest for ipsilateral exposure, meaning tumor on the same side of the brain where phone mostly held.
A laboratory study has shown that radio waves from mobile phones do harm body cells and damage DNA.(According to BBC)
Studies show that use of cell phones for more than 10 years increase the risk of Glioma
Nickel has been found in quite a few mobile sets. About 30% of UK population is allergic to nickel. Rash breaks out where the skin comes in contact with the cell phone.
Lack of Sleep
Scientists at a Swedish University, University of Gothenburg discovered that spending a lot of time on a cell phone disturbed the sleep.
Throughout the world stats have shown an increase in road accidents because of drivers either talking on cell phones or texting while driving.