The overall data on brain tumour and mobile telephony do not indicate an effect of mobile phone use on tumour risk, especially not when taken together with national cancer incidence statistics from different countries. There is still only limited data regarding risks of long term use of mobile phones, but compared to the previous report, the evaluated exposure duration has increased to approximately 13-15 years of use. Thus, current scientific uncertainty remains for regular mobile phone use for more than 13-15 years. It is also too early to draw firm conclusions about risk for brain tumours for children and adolescents, but the available literature to date does not indicate an increased risk.
– Swedish Radiation Safety Authority, 2013