Should children be allowed to use mobile phones? Parents have been receiving mixed messages from health authorities, some of whom recommend that children limit their use of mobile phones on precautionary health grounds. Other health agencies make no such recommendation. Given the enormous popularity of mobile phones with children—indeed, in the United Kindom, more than half of all seven to 16 year-olds own a mobile phone—parents may be understandably confused and worried by such conflicting advice.