Unexpected high data usage on the iPhone
I have since November changed from an iPhone 3G to an iPhone 4S and recently noticed a triple increase in data usage (with additional costs incurred). While I used below 250 MB before I'm now using 470+ MB. A Genius at the Bar recommended to switch off Location Services and Cellular Data, but that doesn't really make sense. Is anyone aware what services might consume exorbitant amounts of data (maybe in background processes)?
Is there an app, that monitors data transfers and could give me some clue as to what app or services use most data?
I've asked my operator to tell me if they would be able to let me know which services might have consumed so much data, but due to privacy regulations they are not allowed to access my data usage history.
I have also read somewhere that Siri uses a fair bit of data, but I haven't used that too much either.
iPhone 4S, iOS 5.0.1