As the iPhone was my first phone I have ever had, (and no I'm not that young: 17) I'm new to this whole trading in thing. I've seen my friends trade in their phones for new ones every year with varying companies. Does AT&T allow you to trade in your iPhone for the newest one? I have a 3GS and I'm planning on getting the 4G/whatever it's called (who knows if AT&T will have 4G by then) in the summer. Will I at least be able to get a discount?