I have a family plan with an eligible upgrade line. I plan on getting the iPhone on friday but i am moving to another state in a couple weeks. People on the board stated that i would be able to just change the number for my one line since i am the only one moving away. ATT stated that this is not possible, and all four lines would have to change area code, not just one. So basically they are saying i would need to keep a San Diego area code number in Dallas, Texas to be apart of the family plan. Anyone have any experience with this type of problem, please let me know if this is or is not possible, thanks!