People have long wondered whether cell phone use might cause brain cancer, but there's been no evidence to prove this connection. A new 20-year study from Taiwan aimed to answer this question, but it only added to the mountain of inconclusive research after finding a positive but ultimately weak, non-significant association between mobile phone use and brain cancer. The conversation about whether radiation emitted by cell phones can cause brain cancer has been ongoing for years, though research has yet to prove a solid connection between the two.