Write this to your own memo, the last time there was a somersault.
In iOS 7 and 8, in addition to setting up--app store Automatic Updates, automatic download, and the use of cellular data to off, do not think that the use of WiFi hanging program, it is foolproof.
This only prevents the system from automatically downloading and automatically updating you. If you manually go to the App Store to download and update, then when you leave the WiFi network, if you let iOS find cellular data ... Your good days will come, and he'll go straight to the cellular data to help you keep doing it.
Therefore, if you want to completely eliminate this phenomenon, you also need to turn off the app Store under the cellular data permissions, so as to fundamentally solve the problem.
PS: The author once to Unicom business Hall change card, the business hall just cover WiFi, full of favor in the renewal of application, later changed the card after the door home, to the home, owe money SMS also came ...
End.
APP store automatically downloads WiFi and cellular data switching mechanism