I sent my perfectly working Gear S3 in as a trade for the Watch 3. I was denied the trade as Samsung said it didn't power on. So they returned it to me and charged me $200 (value of trade).I charged it up and it's working fine. They won't take it back on again. I don't need 2 watches, so I'm sending back the Watch 3. Never had a problem before when upgrading phones. Very disappointed in Samsung. Be careful if you're planning on trading in devices.