The online device valuer Flipsy.com has released the results of a new study on the best way to sell a phone in 2019. Marketplaces - both in a user's vicinity and online - emerged as those associated with the greatest payouts, albeit with some caveats. However, other "buyback" options such as online stores were found to be the most convenient, although the seller might sacrifice the best deal this way.
https://www.notebookcheck.net/Need-money-for-an-old-phone-Local-stores-and-kiosks-are-the-safest-bet-but-not-necessarily-the-most-profitable.435161.0.html