GUZU states they will buy your used phone working or not. I was given an online price of $80 for a NON-working iPhone 5s with non visible damage. Was sent a free packaging and mailer. They then contacted me saying that they had decided to give me only $35 via PayPal. They state after one email that they would ship phone back to me if not agreeable to new deal. In sent two additional emails requesting the agreed upon $80 or to have the phone sent back. No response only to say $35 was ready to be sent to PayPal. $35 is in my PayPal account now but I never agreed to that. Basically stole my phone and sent me whatever they decided was the price. Never deal with these people. Called the number on one of the emails also. No answer of course.