Some health professionals are worried about an extensive use of mobile phones around the world. Some doctors are concerned that in the future, people may suffer health problems from using mobile phones. Even now, there are people who claim that their mobile phones are making them sick. For example, in one case, a young salesman had to stop working because of his abnormal weight gain and serious memory loss. He couldn’t remember even simple things. He would often forget the name of his own child. The man used to talk on his mobile phone for six hours a day, everyday of his working week, for a couple of years.