I didn't expect them to, and the choice to downgrade was mine, just thought it wouldn't hurt to ask. I was grandfathered w/ ATT's unlimited plan, but after a few months I downgraded to save $15. Haven't gone over the 200MB yet, but have gotten close -- and I have to really watch where I use data. Now upgrading from 3GS to 4S, I decided that unlimited data was important. Not knowing how much more I'll use with the 4S, I'd rather have the peace of mind. So, I called ATT, to ask if they would re-grandfather me back to unlimited. The rep was nice, put me on hold for a while, then said that she'd checked with 2 managers and they had said -- quoting her -- "It doesn't matter what phone you buy, you can't go back to the unlimited plan." So I thanked her, and figured I'd try again today before switching carriers. This time the rep didn't even blink -- just said immediately that once the unlimited plan is removed, there is no way to reinstate it. I assume there are lots of other customers asking for the same thing. But I was hoping that they'd rather keep a customer plus get an additional $15 a month. Not sure if others have had success with this, but for me at least, they're standing firm and willing to lose a customer over it. Pre-ordered from Sprint today, all went smoothly. * This isn't intended to start a debate over network/speed/2GB/etc . It's just an observation on the business position.