I have unlimited data so sometimes if I can't get on WiFi it doesn't kill me to use my data. However, I have noticed that even if you have Auto app updates turned on and Use cellular turned on, when you open the app store updates will appear but they won't automatically download themselves. As soon as I connect to WiFi they immediately start downloading. It's not really a big deal to me, just nitpicking. But has anyone ever had their apps auto update when not on WiFi? It has never happened to me in both iOS 7 and iOS8. I don't see many questions about it because I'm sure people just use WiFi and don't want downloads to use cellular data.