I have a question on Contract extension and iPhone Data plans. I purchased the the 16gb 3G over a year ago with a 2 year extension on one of my lines that I have on ATT family plan (let's say line #1) but I use the iphone on line #2 because at the time, line #2 could not qualify for an upgrade. Since then ATT has been charging the data plan on line #2. Line #1 is a non smart phone. Now that time has passed, line #2 qualifies for an upgrade. I want to get a 3GS for line #2 and continue to pay for the data plan but I wasn't sure if ATT would charge me 2 times since I am technically still under the 2 year extension of the first iphone extension. Line #1 will not be the older iphone. It will be just a regular phone. Does any know the answer to this?