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Last Updated: Thursday July 15 2010 17:42 GMT

Doctor's advice on using a mobile phone

Dr Ranj Singh

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School kids in Wales are being advised to cut down on using their mobile phones, in case of health problems.

At the moment there's no proof using a mobile phone does affect your health.

But Wales's top doctor says there may be risks we don't yet know about.

Leah and Sonali spoke to Dr Ranj Singh to get his advice.