Here's a Catch-22, and yet another anti-consumer move on the part of ATT. How do you determine your data usage if you are on the "unlimited" plan? If you are on the current 250MB plan, it shows your usage in your Cellular Data Account page under Cellular Data in Settings. It will show how much you have used and how much is remaining. However, if you are on the "unlimited" plan, it only shows the number of days remaining. This makes it impossible to gauge whether or not the plan is appropriate to your needs. Is there some way to determine how much data you have used? (And ONLY cellular data - not WiFi usage.) Is this yet another reason for class action? Who does this? ATT, that's who!