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Simply because they emit radiation in the microwave section of the radio spectrum. It's the same type of radiation that cooks your food. It has been proven that prolonged exposure to high levels of radiation have a harmful effect on the body. Remember - when you're using your mobile, you're holding the antenna close to your skin - and the radio waves generated go in all directions... including into your body. Anyone using their mobile for lots of voice calls - should seriously consider a hands-free kit.

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