Where has my data gone?
My iPhone 6 running iOS 8.1.3 is gobbling up mobile data at an alarming rate. In Mobile settings, I’ve switched off using mobile data for practically all apps. I’ve switched off ‘Use Mobile Data’ in iCloud Drive’s settings, but I find I can use 100MB of mobile data per day. My mobile data statistics show that almost all of it is accounted for by ‘System Services > Documents & Sync’. Presumably this is for syncing Contacts, Calendar, Pages, and other iCloud features between my iMac, MacBook, iPad, iPhone but why is it still using mobile data? Brian Quinn You’re right, it shouldn’t. Which means that this is a bug in iOS. It’s pretty rare at the moment and I haven’t figured out the steps to reproduce it yet, but I do have one possible work around. Creating and switching to a new iCloud account has fixed this for everyone who has tried it, suggesting a document or system service on the old account is getting corrupted and constantly thinks that it must sync itself to iCloud. Right now there’s no way to identify nor eliminate the culprit without a new iCloud account. Make sure you report this at apple.com/feedback.
Documents & Sync should rack up only a few megabytes per month, not 100MB per day.