Is there any way I could disable the system services that use data when I am not connected to wifi?
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I agree with user185442. This seems to be impossible. I spent a long time disabling data traffic for all non vital apps and services, including things like Music, iBooks, App Store and a large number of 3rd party apps. I still got 912 MB "System Services" usage in an afternoon. The culprit (apart from Apple's programmers) seems to be iTunes purchases, that probably somehow were downloaded over 3G, even though Mobile Data was disabled for iTunes & App Stores.