Right now, two separate accounts, both with unlimited data. Her: iPhone 3GS, unl. data Me: iPhone 4S, unl. data She uses her upgrade to order an iPhone 5. Her: iPhone 4S (w/ her iPhone 3GS SIM) - does she keep unlimited data? Me: iPhone 5 (w/ ???? do I have to go to AT&T?) - and do I keep unlimited data?