“In human epidemiological studies, cell phone use has been linked to an increased risk of brain and salivary gland cancers. Studies from teams of scientists in several nations have raised troubling questions about possible associations between heavy cell phone use and altered brain metabolism, sleep disturbance, and even diminished sperm count and sperm damage. In 2011, the World Health Organization declared cell phone radiation a possible carcinogen.
Animal studies support the findings in people. A multi-year study from the U.S. National Toxicology Program found that male rats exposed to radio-frequency radiation from before birth through two years of age had a greater chance of being diagnosed with a brain cancer called malignant glioma, as well as developing a tumor found on the heart. The radiation levels to which the rats were exposed included levels that current cell phones are allowed to emit.”