Max has read that the iPhone 7 emits twice as much radiation than any other phone and he's concerned his wife is being exposed. Leo says that radiation coming off a phone is "non-ionizing," which means it poses no harm to people. There is no evidence that cellphone use contributes to brain cancer. In fact, brain cancer statistics have gone down over the same time as smartphone use has gone up. And most people are using their smartphones more as a handheld computer, rather than an actual phone.