My wife has an iPhone 3GS with unlimited data on it. I have an inactive iPhone 3GS that we want to activate. I need unlimited data, as the 2gig max is simply not enough for constant streaming of pandora and the like... My question is this... If we add my iPhone to her plan as a secondary device, can I opt for the unlimited data plan? The last thing we want to do is cause her to lose the unlimited plan as well. If I cant get the unlimited plan, I won't even bother activating the device and will just use it for an iPod touch.