In order to limit your data consumption; you may want to turn off automatic updates on your Apple device. This will ensure that all of the data included in your Wi-Fi plan is not consumed in a short amount of time.
1. Tap the "Settings" icon
2. Scroll down and tap "iTunes & App Store"
3. Scroll to the section titled "Automatic Downloads"and ensure that all 4 swipe toggles are off and no green is showing.