I am on the 200 MB plan with AT&T. I last reset my cellular statistics on April 9. Since then, it says that for my current period, I have used 65.1 MB. I have turned off many apps for them not to use cellular data. The only apps that have used data since April 9 are Mail (13.7 MB), Safari (21.4 MB), Stocks (1.7 KB), and Weather (27.6 KB). "System Services" at the bottom of the list, however, has used 30 MB! When I tap System Services I see a long list of items that have used data such as "Messaging Services", "Software Updates, "iTunes Accounts", "DNS Services", etc. In the System Services settings in Privacy, all but 3 settings have been turned off. I would just like to know why "System Services" uses so much data. I do not want to upgrade my data plan as I really don't use that much data. Thanks.