Once you sign up for unlimited, your options change to 250MB, 2GB Or Cancel. In other words, once you start UDP, you can't cancel it unless you want to be left with the two limited plans. I guess ATT is giving a grace period to allow all the people who bought the ipad but have not received it the chance to sign up for UDP. It's better than nothing but it still ends the ability to stop and start, which was a major selling point for many of us. I'll be honest, I probably would have gotten the 3G even if there hadnt been the offer of UDP. Now I have to decide whether or not to keep paying $30 a month. If AT&T planned this out completely, they are real scumbags. They should have just said from the beginning that if you want unlimited, you basically have to sign a contract. There's no early termination fee, but if you fail to renew, you never get UDP again.