Hey, where could I sell my iPhone 6S? I am getting a new one. There is nothing wrong with this phone. The reason for a new one is because this one is locked to Sprint and I recently switch to T-Mobile so T-Mobile is sending me an iPhone 6S. I tried selling on both eBay & Amazon at retail which is $650 but no one has been buying it so I have been lowering the price and I have it at $500 right now.