Turns out that you can query this directly (with iOS devices) luckily with ipads you can look at exactly which applications are using that bandwidth. If they have someone look at: Settings>Cellular>Use Cellular Data For There will be a list of all the apps on that device and what amount of data has been used in the current period. This will tell them exactly how much explorer has used. Anecdotally my current period usage for explorer, when used very little, is 4.3mb and for collector which I use frequently is 174mb.
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