Exceptionally Efficient. Bought my daughter a used Note 8 from a re-seller on swappa. Had my first bad experience on AT&T unlock page saying the device hasn't been activated on their service for at least 60 days. DoctorSim got me the unlock code in less than an hour.
Transaction went without a hitch, seller was very helpful, phone was exactly as described. Will definetly use Swappa in the future and will recommend it to my family and friends.