Using a mobile phone for more than 10 years does not appear to raise the risk of brain tumours, according a new study that re-opens the debate on the safety of the devices.

Researchers found that there was no significant increase in the incidence of cancer among adults who have been using them for up to a decade. They found that there was no change in rates between 1998 and 2003 compared with the previous two decades.

The findings, which come from a study of the populations in Denmark, Finland, Norway and Sweden, all of which are heavy phone users, appears to contradict the expected results of another long term study.

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