Since I updated my ios several days ago I have been using a lot of data. i have not changed anything about the way I use the phone. I ran a check last night and again this morning and I used almost 25% of my monthly data allowance while I was sleeping last night. Obviously this update has changed something. Any suggestions on anything I could do to stop this? I have already called ATT and they were no help. They said they have no way of knowing how the data is being used.