So, I got my iPhone 4 today, and of course I had to update all of my apps. I have not yet connected my new iPhone 4 to my wifi network yet. So I started updating apps on my iPhone (iPhone) like I normally do. Later while I was going through my settings on the phone I noticed that the phone had already downloaded over 4Gb of data only doing app updates! Now I see why ATT removed the unlimited data plans very clearly.