Sorry if posting a new topic was unnecessary, but I actually had this confirmed by an AT&T store manager. If you have one family plan line that is upgrade eligibile you CAN upgrade it to an iPhone at the discounted rate and have the phone switched over to your other lines. The process was described like so: 1)Eligible line is upgrade to the iPhone. 2)IMEI etc. is switched over to the desired line. 3)Plan etc. is added to desired line. 4)Walk out with cheap iPhone on your non-upgrade eligible family plan line. Caveats: The line being upgraded must have a 3G sim card. Otherwise, the system will not allow the upgrade. I was advised to have my second line user go grab a 3G sim card at a local ATT (they are out of state) before Friday. The contract on the line eligible for upgrade will have its contract extended. YMMV: I had another local store say it is impossible to do, but this is obviously not true. The store manager I spoke to said he trained all of his employees on this exact process yesterday, and that it would be no-hassle. I hope this information is helpful! Enjoy!