I've got a Samsung S3 on a 500MB Vodafone plan. I've just had a text SMS telling me I've passed my 500MB limit. The odd thing is that I have my Data Usage warnings set to the correct dates to warn me if I pass 400MB but my phone thinks I've only used 213MB in the period that Vodafone say I've gone past 500MB. Gallery usage is high - 90MB. Not set to auto-upload to Facebook, Dropbox or anything I'm aware of... How can there be a discrepancy > x2?