I have an iPad 2 with internet access on AT&T. My billing cycle starts on the 10th of every month. On Monday of this week (7 days into this month's billing cycle) I received an email stating that only 20% of my data plan for the month remained. I have the 250MB/month plan, which historically has been sufficient for my usage (email, web surfing, normal stuff, etc.). Between the time when I received this message and today, I did not use my iPad. So, today when I opened up my iPad there was a message on the screen stating that I had less than 10% of my data plan remaining. I checked the status of my account and saw that I only had 7MB remaining. So, between Monday and today (Tuesday), I did not use my iPad, it was connected to a wi-fi signal the entire time, and I somehow used 43MB of data. The only apps that were running in the background when I turned my iPad on tonight were Mail and Safari. I do have my work email linked to Mail and set to automatically sync. I called AT&T tonight and they told me that even when I am connected to wi-fi I am using cellular data. I said that I didn't think that made any sense. Does it make sense? They said that the only way I can use wi-fi exclusively and not have it also reduce my monthly cellular data allowance is to turn cellular data off. I thought the only time that I was using cellular data was when I was not connected to wi-fi. Any insight would be appreciated. Thanks in advance! ---------- I am not sure if it makes a difference, but I have updated to iOS5. In prior months, my total data usage was around 190-200MB. I have somehow used 243MB in the first 8 billing days of this cycle and my usage has not really changed. Could this somehow be an iOS5 issue?