Getting some user complaints, we should investigate sooner rather than later.

Also we may want to add settings to control dat a usage so its not such a big deal if there is a bug

save saved pages, only on Wifi, downloading images, image quality, etc…

Additionally, it looks as though this can occur when just visiting an article

From a user:
https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom;TicketID=9564577

The Problem happened to me a couple of times when I was on the road. I activated the
mobile data for the app to view one article the progress bar moved very slowly and I
reached my mobile data limit for the month before the article was displayed. At least one
time I am absolutely sure that I had resettled my mobile data statistics before the trip
and that the unsuccessful loading of only one article lead to about 100MB of data. But I
do not remember which article I was loading.

So I'm trying to reproduce the issue now:

• deactivating WIFi
• reset mobile data statistics (screenshot)
• activating the Wikipedia App and loading the Articles about Paris and Berlin (both in

English)

• got 20MB traffic (screenshot)

Not as much as I expected but still a bit of data.

My guess is:

• May be all pictures are (pre-)loaded in full size version
• I have a couple of articles marked as favorites, maybe they are updated in the background