Here is my situation: I currently have one line with unlimited data in my account, which is eligible for an upgrade. I do not want to use the upgrade to get an iPhone 5s because I want to keep my unlimited data. In order to avoid paying full price for the phone, which I don't think will be possible on Apple's website at launch, could I: 1)Add a second line and get a subsidized price iPhone 5s with a tiered data plan. 2)After activating the iPhone 5s, get a "dumb phone" and activating that instead to this line to drop the data plan and therefore lowering the cost to $10 + taxes a month. 3)Activate the new iPhone 5s into my unlimited data line. Is this possible? I would appreciate it if anyone can chime in from prior experience. Thanks.