So I plan on holding off on my upgrade with AT&T until the new iPhone comes out. My question might actually relate more directly towards AT&T than Apple, but oh well. I know that they require a data plan to be added when you upgrade to the iPhone. I'm wondering if that means I need to have that same data plan for the rest of the 2 year commitment? For example, if I got the $30/month plan, does that mean I need to have that for the whole contract? Can I change it to the $15? Could I get rid of the phone and have no data plan?