Samsung Galaxy SIII: Manually Switch Mobile Data Off...

When my S3 is in a WiFi area, do I have to manually turn off the Mobile Data in Settings or will it automatically work off the WiFi and not use up my Mobile Data?

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The S3 will switch to wi-fi whenever it is available. If you haven't previously connected to the wi-fi network then you'll have to configure and save it first.

Thanks tavenger, that makes sense. I've been watching my data now when I'm home all day and the data doesn't seem to be rising much at all. But Driving Mode is a whole other beast... I definitely have to shut it off manually!

btw, there are apps you can download to limit and track data consumption.