Wonder if its a glitch with your iCloud back up. When you connect to a power source and wifi it may be backing up but using your data instead of the wifi. I would have Apple do a diagnostic on your device to see.
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iPhone suddenly using massive amounts of data
- Thread starter Le Big Mac
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Same thing happened to me with my last months billing cycle. I have an iPhone 5 with AT&T, I ususally use about 3gb a month and this last billing cycle it said I used over 7! I've had iPhones since day 1 and I never ever used anywhrre close to that much data. I do not use iCloud, and my LTE is switched off because it's not in my area yet and I thought that would save some battery. I did a complete restore and so far I don't see any strange spikes in my data usage. Just like some earlier posts my usage on my bill showed very strange big chunks of data used at times I'm not typically on my phone, like at work and sleeping. Hopefully this restore does the trick.
Weird, then it does seem like a glitch in Verizon's system then. Since I have gotten my first iPhone I have used data usage.
(https://itunes.apple.com/us/app/data-usage/id386950560?mt=8)
It has always been accurate. If anything it says I use more data than I actually have.
Check the settings for the Facebook app, if she has it installed. This app now preloads and plays videos in your feed/stream/whatever they call it.
The settings are in the iOS settings app, under Facebook, and not within the Facebook app itself.
Could be the culprit. Also, double check that she is on wifi at home. I know so many people (parents included) that have issues only to realize they are not connected to their home wifi. I have no idea how this happens, because it's after I've checked they were set to automatically connect, but it does. Also know of a firsthand situation where the home wifi signal wasn't strong enough to cross the entire house, and they didn't realize it. So again, double/triple-check wifi connectivity throughout the house.
The settings are in the iOS settings app, under Facebook, and not within the Facebook app itself.
Could be the culprit. Also, double check that she is on wifi at home. I know so many people (parents included) that have issues only to realize they are not connected to their home wifi. I have no idea how this happens, because it's after I've checked they were set to automatically connect, but it does. Also know of a firsthand situation where the home wifi signal wasn't strong enough to cross the entire house, and they didn't realize it. So again, double/triple-check wifi connectivity throughout the house.
Yes, the Facebook app, I turned off auto streaming videos on my Note 3 and data utilization went way down, darn you Facebook!