More than 350,000 people were surveyed by the team from the Institute of Cancer Epidemology in Copenhagen. The study's participants subscribed to mobile contracts before 1996, and the study looked for new diagnoses of brain tumours between 1990 and 2007.
They concluded there was no association between tumours of the central nervous system or brain and more than 10 years' use of mobiles.
But others criticised the study for ignoring the 88% of Danish users who started using mobiles since 1996, as well as leaving out business users (often the heaviest users). Others pointed out brain tumours take decades rather than years to develop.