Hmm, even called AT&T to confirm, doesn't matter how long you've had multiple lines on your account, you can only buy one iPhone per person per day. I'm glad I asked while I was at the store checking out cases today. I was going to buy two, one for my girlfriend and I. Now she'll be joining me to wait. Just a heads up on what you might encounter at AT&T stores. I think the idea is ridiculous. This wasn't the case in previous years.