Swappa seems to be the most popular all in all, but I'm sure it varies greatly. Depending on the phones, and the amount, may be better off selling individually on ebay/craigslist.
But if you want to donate your phone, take a look into the iFixit site's donation program: https://www.ifixit.com/Info/Device_Donations
Keep in mind that for really popular models there's no need for more but if you have a lessor known model or one that they don't have access to but there's a demand, donating can help expand their database of service guides. If they do want your phone, it's a no cost matter for you as they even send you a postage paid mailer.
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