I have always had success on swappa and Craigslist. Craigslist is safe as long you do it the right way. Make sure you meet them inside a carrier store or I have even heard of people meeting at police stations. Swappa is a great tool to use also. I have sold two phones on there with no problem. The only thing I don't like is paying for shipping and the $10 fee. If you could find a person willing to meet you somewhere safe, I would do craigslist
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