All mobile phones in Britain will come with health warnings under new government guidelines to be rushed out before Christmas, newspapers reported yesterday. The Health Department is finalizing the wording on a leaflet that will be distributed to shops selling mobile phones, the papers said. The leaflets were expected to specifically warn that childrren should not spend too long on mobile phones, despite continuing debate among medical experts over the existence of health risks to users. "There are still fears that using mobile phones could have a harmful effect. We will produce advice for consumers shortly," a Health Department spokesman said. More that 25 million people, nearly half of Britain's population, own a mobile phone. A quarter of the users are younger than 18 and that number is expected to rise after Christmas. Scientists can't agree. Scientists are split on if there is irrefutable medical evidence that mobile phone cause brain tumours or other health problems. Last week, the Lancert medical journal published two articles with opposing views on the safety of the phones. Physicist, Dr. Gerard Hyland from England's University of Warwick said mobile phone users younger than 18 were vulnerable to headaches, memory loss and sleeping disorders. He said there was too much uncertainty about the potential dangers of mobile phones for them to be classified safe. But Massachusetts scientist Dr. Kenneth Rothman said his research indicated the main public health concern was motor vehicle collisions, rather than any possible link to brain cancer. Heavy mobile users were involved in twice as many fatal road accidents as light users.