i bought an iphone opening weekend, changed the housing to black (some might remember that post), and sold it. been using a SE k850 and T650 since. thinking about picking up an 8GB iphone since the price has come down. will probably hold off until next month to see what comes out with SDK, but my question is.... i have my old iphone's sim card and am still on an iphone plan with ATT. if i buy a new iphone, i can simply insert this sim card and begin to go, right? there's no need to activate it like the original iphone. normal sim cards can be swapped without a problem. just want to make sure a new iphone is essentially the same. thanks!