I am having the same problem. I am disappointed in the I phone 5s for not giving me the option to turn off background data via cellular.. just via wifi like my other phone a Samsung Galaxy 4s... We just bought the phones on May 31... I am trying to resolve the data usage issue but am thinking of seeing if ATT will exchange the phone, even though it has been more than 30 days... however I think I have made a good faith effort to turn off things manually.. except all cellular data because I shouldn't have to constantly switch the phone settings at night (cell data usage is occuring while on the network but while the phone is locked and we are sleeping)...
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