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:
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.