Normally, I'm in a situation where I want to upgrade my iPhone to one that is more expensive but now I'm in the opposite situation and am unsure of the most advantageous way to trade in my iPhone 6 (64GB) (retails $649 outright from Apple) for the iPhone SE (64GB, retailing $499). I've had my iPhone 6 since it came out, so it's 18 months old. It has no damage, no scratches, and no faults except for some wear around the ringer/vibrate switch. I know it's not possible to profit from the trade-off but I'd like to know what you think is a fair price difference for me to "upgrade" to the less-expensive iPhone SE. I'm with AT&T but it seems like if I use their trade-in program, I'd only get around $220 at most for my iPhone 6. I don't know what Apple's trade-in program would offer. And I see my iPhone going for over $400 (though they are brand new) on eBay. Is there a best way to get close to the value of the iPhone SE in my trade-in? How much should I expect to pay out to make the switch, and where will I get the best value for my iPhone 6?