So, I have found someone who will buy my iPhone for $300 and I was just about to sell it but I called 5 at&t stores and 2 times to the AT&T help line thing and asked them if I take my sim out and put it in my Samsung Solstice, will I lose my data plan. They ALL said yes and that overnight the servers will be updated and It will see I have the Samsung and drop the iPhone plan and not be able to get it back. They ALL said this and they said they don't recommend doing it until I have iPhone 4 in my hands. I have told the buyer that I am going to wait until next week to sell and she said she will see if she is still interested then. This sucks but I am not risking losing my unlimited plan. What is the deal with this? Why are there so many different people saying different things?