Don't you have to have your phone turned to airplane mode while on an airplane? I am going to Japan soon and was testing my book apps for possible problems. When I tried the ibooks app it said that while I had the airplane mode on it said that I had to "turn off Airplane Mode or Use Wi-Fi to access data". So this means that I can not use this while on the plane. So if I were to get an ipad I wouldn't be able to use that on the plane either? Geez. While the kindle for iphone app works. Which is great to know but I always thought that the kindle app uses wifi to access the books while I was reading. Exactly how does that kindle app work? I know that is a stupid question but one that I could use an answer to.