I purchased mine on eBay with serial number SM-G975F and I could not register on the Samsung website. I was told it is not American type so I cannot register on the Samsung USA site. I cannot believe such nonsense. now I am at a loss on what to do. you would expect Samsung to have a website dedicated to meeting all the needs of their users in every continent and country. I would be happy if anyone can offer a solution to this Samsung BS.