iOS 9.0.1 data usage
--I have iOS 9.0.1 installed on my iPhone 6.
--Rarely ever use LTE/4G service, as home and office have wifi and we have a public wifi network that I use in town.
--I've had Wifi Assist turned off for over a week.
--My usage hasn't changed at all. If anything, I use my phone less lately than I used to.
What the heck is going on here? My phone and my husband's phone (6+ running 9.0.1) are both doing something at 3am every day when we're both asleep, have both phones plugged in, and have strong wifi, but where his is sending out about 120K, mine is sending out about 30MB. This doesn't make any sense to me. I know where my major data usage is, but this doesn't add up.
**I should add that I am aware that AT&T does three-hour data intervals.