Specifically, connecting an iPhone 2G to a current version of iTunes will simply turn it into a iPod rather than starting the plan activation process. There's some speculation that running an older version of iTunes will allow for activation of the old 2G plan, but I don't know if anybody has tried yet.
So what you're saying is your sister already had the unlimited plan and just upgraded to your used 4? This is nothing new for her to keep her unlimited.
So what you're saying is your sister already had the unlimited plan and just upgraded to your used 4? This is nothing new for her to keep her unlimited.