Editor's Note (2026): This article has been updated where scientific understanding has changed since it was originally published. Updated information is marked with an asterisk (*) and explained in the Update Notes at the end of the article. What the experts said (as summarized by the American Cancer Society at the time of writing): American Cancer Society (ACS): Taken as a whole, most studies to date have not found a link between cell phone use and the development of tumors. National Cancer Institute (NCI): Although research has not consistently demonstrated a link between cellular telephone use and cancer, scientists still caution that further surveillance is needed before conclusions can be drawn. National Toxicology Program (NTP): While the weight of the current scientific evidence has not conclusively linked cell phones with any health problems, the NTP and other scientific organizations conclude that additional data are needed. Centers for Disease Control and Pre...