I just noticed today, because of a text alert from Verizon, that my wife's phone has been burning through data from 2am-5am every night since July 1. Its eerily consistent; data usage starts at 2:00 AM or 2:01 AM and ends at 5:00 AM or 5:01 AM. Even the times in-between match all too often. The amount of data hovers around 80-90 mb per night. Like I said, it started on July 1. I know that our phones just received an OTA update.
My phone doesn't show any data usage but I'm also using my WIFI connection. I'm going to turn off my WIFI tonight to see if my phone does the same thing.
Thanks for any help/information you can offer.