I purchased the unlocked 16GB iPhone 5s a couple months ago and realize now that I need the 32GB model for my usage. I've never sold a phone this new before so I was hoping for some input on the best way to do it. In the past I used Gazelle.com since it was super easy and fairly priced for old phones. But for a flawless unlocked 16GB model they are pricing it at only $350. Should I expect more than this? Any recommendations on where to sell?