Shops will check if the device is blacklisted or reported stolen; you must bring a valid government ID.
Sites like Swappa allow you to sell directly to other users, which typically results in the highest payout because there is no middleman taking a large cut. pawn shops that buy cell phones
Services like The Whiz Cells often pay more than automated kiosks or pawn shops, though you have to wait a few days for processing. Shops will check if the device is blacklisted
You have to physically visit multiple shops to compare offers. Alternatives for Better Value pawn shops that buy cell phones