I'm wondering if anyone has gone through this process and if it's possible. Our family plan has 5 lines, 1, 2 & 3 are iPhones and 4 & 5 are regular phones. This plot only concerns two lines. Line #1: My iPhone 3GS purchased June 2009. Contract is up June 2011 and full upgrade-eligible February 2011 Line #2: Other iPhone 3GS purchased February 2010. Contract is up February 2012 and full upgrade-eligible October 2011. When the new iPhone is announced tomorrow, I planned on doing a mid-contract upgrade on my Line (#1) which would be at the (assumed) $399 and $499 price points. AT&T's site says: Line #2 gets the same message, but of course has an October 2011 date quoted. Rather than push Line #1's competition dates out a year each, it would be smarter to buy my new iPhone with Line #2's semi-eligibility (same prices, of course), but that contract would only be extended by 4 months. In regular phones, this wouldn't be an issue: buy the upgrade for Line #2, when the phone arrives, put my old full SIM card into the new phone and give the SIM card that arrived with the new phone to Line #2's old phone. However, the new iPhone will most likely have a Micro SIM which means we can't just do the SIM swap. Has anyone ever done a transaction like this where AT&T allows you to order the phone for Line #2 but have the new SIM card be programmed for Line #1's phone number? Alternatively, do you think it will be possible for me to trade my full SIM for a Micro SIM after the new iPhone arrives? Thanks in advance!