A public announcement from The National Toxicology Program is expected soon about a study recently completed on rats that links cell phone use to cancer risk in humans. The study showed significant increases in cancer in rats that were exposed to cell phone signals for two-years. Federal agencies are trying to determine the best way to inform the public about this danger that could effect so many Americans (according to the Pew Research Center, 90% of American adults own a cell phone).
More details at http://microwavenews.com/news-center/ntp-cancer-results
Or if you are really ambitious, read the study, http://biorxiv.org/content/biorxiv/early/2016/05/26/055699.full.pdf