Device condition is going to make a huge difference in the amount of money that you're able to get back for an ‌iPhone‌, ‌iPad‌, or Mac. Cracks, display issues, and other problems will drastically lower the amount of money you can get for a device. A functional device in good condition with no scratches or other damage is going to fetch the most money. Some sites will let small wear and tear issues slide, while others will deduct cash if a device isn't in perfect condition.