>He added SMS alerts tell customers when their data allowance has hit 80 per cent usage. A second text is then sent once all that data has been gobbled.
This happened to me, well the massive missing data available did, no text or anything. Although the nice chap at EE added a wedge of free data when I phoned up and asked him where my allowance had gone. The weird thing is he didn't acknowledge an issue, and confirmed that according to his system the allowance was indeed missing.