Yes, cell phones as well as cordless phones transmit radiofrequency radiation (RF). Radiofrequency radiation is not like other forms of radiation, such as x-rays. We know that RF can cause cancer. It is not known if radiofrequency radiation (RF) from mobile phones could cause long-term health issues. International Agency for Research on Cancer has designated RF radiation as possible human carcinogen. (A carcinogen refers to an agent that can cause cancer.