Huge bill on O2 - unknowingly downloading data

mobilejunkie

Or you could pay about £6 a month for a better bundle and a decent free phone on a cashback deal (or about £4 with a throwaway phone).

maurice28

I know you said you have never downloaded an app, but you might want to download something like Onavo Count, which tells you how much data you are using. It won't help with this bill obviously but in the future it would flag if your phone was downloading anything.

Just make sure you download the app using wifi!