My experience buying 4 Samsung S21 Ultra Smart phones From Amazon and Ebay. Although this is a good example for lots of different phone types from iPhones to Androids. 90 DAY UPDATE- Both phones are working great have had 0 issues so far 6 MONTH UPDATE - Both Phones are still working great no issues Link To Amazon https://amzn.to/44o2xZl Links are affiliate, it costs you nothing to click but we earn a small commission to help support this channel.