My wife's phone (which I get the job of managing) is at 3020.972 of 3072MB for 90 days in the Data & Add-On Usage screen. Her Usage History shows only 431MB used. I'm pretty sure neither is correct, but why are they sooooo different?
It's a OnePlus One. Billing isn't until Dec 5. I actually don't have the report from her phone as I'm not really looking to explain that to her just now... All that data is from the user account info on Public Mobile's site.
