If you want to trade your iPhone in for a new iPhone, the Apple buyback program can be helpful in that it will give you a discount toward the purchase of your new iPhone, or you can get and Apple gift card. The discount you receive or the amount of the gift card will depend on what version iPhone you are trading in and what shape it’s in. If you are looking to sell your old iPhone to get another type of smart phone or just get some cash though, you will probably do better selling your iPhone some other way.