Woke up to an email from Vodafone saying we had gone over our monthly data allowance, according to vodafone tracker we used 11 gigs out of our 20 in 2 days.

Neither of us has done any abnormal browsing, just wondering of anyone else has experienced this issue? I know both Mircosoft and apple put out updates over the past few days, didn't think they could be that big.

Is there any way of finding out / tracking where the data was used?