iPhones and smart phones are less likely to cause cancer than earlier models according to a new report by the World Health Organisation. However, frequent use still could cause cancer.

The International Agency for Research on Cancer said heavy usage could lead to an increase incidence of giloma, a malignant type of brain cancer and young adults are mostly at risk.

Professor Bruce Armstrong, University of Sydney, a member of the team that conducted the research told the ABC that “there is an observed association between using a mobile phone and a higher risk of brain cancer”.

Although research into smart phones is in the primary stages, Professor Armstrong said that the “3G phones in fact give a much lower dose to the brain that the previous generations”.