I have not had this problem, but I know people who have. The problem is not being able to turn on Wi-Fi on your iPhone or iPad. I am not talking about Wi-Fi not connecting, but Wi-Fi not even turning on at all. When you think about it, that can be a little scary. You might think there is something wrong with your iOS Device hardware. This article lists several things to try that will probably fix this issue. One of the easiest things is just to Shutdown and Restart your iOS Device, which we seldom do.