Over the last two decades, a large number of studies have been conducted to assess cellular phone health risks, particularly studies in human populations (epidemiologic studies) seeking to determine if cell phone use is a risk factor for brain cancer. A number of studies have also investigated the potential effect of RF exposure on cancer in laboratory animals, brain electrical activity, cognitive function, sleep, heart rate, and blood pressure in volunteers. To date, there is no consistent scientific evidence of adverse health effects from exposure to radiofrequency fields at levels below those that cause tissue heating.
Animal studies consistently show no increased cancer risk for long-term exposure to radiofrequency fields, and despite considerable effort, no plausible biological mechanism has been identified whereby RF at levels emitted by cell phones can initiate cancer.
Cell phone user’s RF exposures come from two sources. One is cell phone towers, which send signals to cell phones through RF waves. The RF fields, created by cellular base stations, in typical public areas may be equal to or les than a few microwatts per square centimeter (10-6 Watts/cm2). The cell phone itself sends signals to base station antennas with the power of thousands of microwatts (10-3 Watts). Because a cell phone is typically held against the side of the head when in use, much of the RF energy is delivered to very small volumes of the user’s body. The greatest RF exposures are from cell phones, not from base stations.
(2015, January 13). Harvard Campus Services – Environmental Health & Safety | Cell Phone Towers and Radiofrequency (RF) Radiation Safety. Retrieved August 14, 2017, from