A major study of mobile phone use found that not increase the risk of brain cancer.
Using data from more than 350,000 people in Denmark over nearly two decades, researchers found that those who used the phones for 10 years or more had a similar incidence of cancer than those who did not use.
But some experts have criticized the methodology of the study, published in the British Medical Journal. They argue that those who use cell phones to their businesses were excluded from the investigation.
A British expert, Professor Denis Henshaw of Bristol University, said the study confused the public and decision makers, about the safety of using mobile phones.