The 2.4GHz frequency used by cordless phones in the USA can cause heart irregularities, according to research published in the European Journal of Oncology.
The study, entitled 'Provocation Study using Heart Rate Variability Shows Radiation from 2.4 GHz Cordless Phone Affects Autonomic Nervous System', was led by Professor Magda Havas of the Environmental & Resources Studies Department at Canada's Trent University.