The WHO warns of cellphone cancer risk
However, any link is not certain - they concluded that it was "not clearly established that it does cause cancer in humans".
A cancer charity said the evidence was too weak to draw strong conclusions from.
A group of 31 experts has been meeting in Lyon, France, to review human evidence coming from epidemiological studies.
They said they looked at all relevant human studies of people using mobile phones and exposure to electromagnetic fields in their workplace.
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