On the other hand, why do some medical studies show chanege in the brain cells of some people who use mobile phones? sings of change in the tissues of the brain and head can be detected with modern scanning equipment In one case, a traveling salesman has to retire at a young age because of serious memory loss He couldn't remember even simple tasks He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week for a couple of years His family doctor blamed his mobile phone use but his employer's doctor didn't agree.