If you happen to live in an area where you are always on the ATT network and not likely to "data roam", data reporting should be fairly quick. So, try this one month. Turn off cellular data and reset the phone stats at least 24 hours before the end of your cycle, if you can turn if off even earlier, that would be better. This should allow all data used in that billing cycle to get reported. Now in the new billing cycle, your phone and ATT's usage should be much closer and theoretically, ATT's usage should be equal to or lower than what your phone is reporting.
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