I mentioned it in another thread, but thought I'd share my whole story here: I had an unlimited data plan from my iPhone 3G, 2 on this family plan actually (one is my fiancees) and had been monitoring our data usage the past 6 months. I would get close to 2gb/mo a few times, but never went over. She was no where near as close. When I decided to bail on iP4 and go w/the Cappy, I stupidly decided to ditch the unlimited for 2gb+ tethering. Well after just a few days reading here and watching how much data this thing hogged up, I realized I had made a mistake and immediately called AT&T to see what they could do. Apparently if you give up your unlimited data, you have 48 hours to switch back, something that was not told to me at time of sale. I had called on my 51st hour after purchase... So the chick on the phone told me there was nothing that she could do, so I proposed this situation: Return the Cappy and get back on my iPhone unlimited plan, then re-buy the Cappy and keep my unlimited data. She couldn't say "yes" for sure, but I could tell by her tone that I had found a loophole. I went back into the store where I bought it and presented this situation to the asst. manager, and he said that he thought he could get around it without me having to return the phone. It took about 24 hours, but I have my unlimited back! So excited I don't have to worry about killing apps every 30 mins and keeping an eye on 3G Watchdog and Juice Defender all day, it's a great feeling! Sure I gave up tethering, but it's saving me $15/mo and who needs it with all that this phone can do. Who else is lucky enough to have grandfathered in the unlimited data?