When not in WiFi range, do Push notifications and Cloud services use cellular instead, without her knowing? Could all the pictures she took uploading to Photo Stream use up her data?
Not sure if I'm using the correct jargonů
What is her data plan first?
If it's the minimal 2-300M a month anything from maps to Photostream will use it up. Push Notifications are minimal, not to worry about. If she uses Photostream when not around wifi maybe, but she would have to be taking a boatload of pics.
Streaming video is one of the biggest hogs. youtube, Netflix, etc.
If she has a 3 gig plan then it has to be streaming video as the other things I mentioned don't add up to much.
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