I know this article is a few years old but there are a few new online websites like CellCashier and Technollo that will pay more money for your used iPhone than Gazelle.

As you mentioned “depending on where you sell”. Probably the most money you would receive from Craigslist or eBay. Swappa is a good option but just like with eBay you never know what kind of person would buy your iPhone and then complain to PayPal. Last year I sold my Verizon iPhone 5s on CellCashier and I was offered…