Data sense - restore data

I would think that is the data from the Backup on OneDrive. Did you restore your phone from a backup recently after re-setting or initial set-up?
 
I would have assumed it would only use WiFi, but perhaps the restore action will use any connection. That's a question for the MS Community boards, though you may not get a response... Sorry I can't help you more on this - I've only restored after setting up WiFi.
 

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