An electronics expert has claimed that some people who use mobile phones heavily have started to develop cancer. Researcher Alisdair Phillips made the claim during a legal hearing brought by scientist Roger Coghill, who is trying to force retailers to put health warnings on mobile phones. Mr. Phillips told the court: "I have received frequent reports from regular phone users telling of headaches, loss of concentration, skin tingling or burning and twitching. "The complaints can involve eye tics, short-term memory [loss], buzzing in the head at night and other effects such as tiredness. "This is the first time in human existence that people have wandered around with radiating devices held close to their bodies. . . . "It is too early to say, but we are starting to se lymphomas of the neck in heavy phone users."