Radium wasn't used for over a century all over the entire planet and exposed to most of the entire population of the world their entire lives. It's literally the worst comparison to non-ionizing radiation possible. I think if there were significant issues with non-ionizing radiation, we would have a large sample size by now since almost everyone is exposed to it their entire life. Also, what is significant about your phone heating up your ear? I can my make ear red with heat by wearing a toque in a warm room, that does not have anything to do with if it causes cancer or not.