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There still aren't any good explanations for how mobile phones could cause cancer. The microwave radiation they transmit and receive is very weak. This radiation does not have enough energy to damage DNA, and cannot directly cause cancer.
Mobile phones also produce small amounts of heat in the brain, but again, not enough to pose a health risk. Scientists have put forward other theories, but, so far, none of them have been conclusively proven, despite a lot of research.
In 2000, the UK signed up to a set of international safety standards, which set a limit on the amount of radiation given off by phones. These limits have a very large safety margin to protect people who may be more sensitive to phone radiation, such as children.
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