I currently have a 3G 16gb iPhone and my wife has a 3G 8gb iPhone. We both got them on the same day (July 17th last year). When I check the upgrade eligibility, it says I can't upgrade 'till 12/17/2009 and her line says 03/17/2010. Now, she doesn't really need an upgrade to a 3GS (and of course she'll argue that I don't either) but I do want one. I'm eyeing the 32GB model, but I'd have to pay the $499 instead of $299. Since her upgrade date is further out and I'd have to pay $499 either way, should I upgrade her line and then after I get home, swap the handsets? That way, I'd get my 3GS 32gb, she'd get my 3G 16gb, and then my line is still at 12/17/2009 and he line will be like 06/17/2011 (or a few months sooner I guess). Just wondering if I'll have any issues with the lines or accounts if I do that "swap". Thanks!