Because there are knockoffs, parallel imports, clones, refurbished machines and so on. The IMEI number of mobile phones in the market can be changed by brushing, so it is impossible to accurately identify the authenticity and authenticity of mobile phones only by serial number, software testing, IMEI number and mobile phone origin. If you want to identify whether the mobile phone is genuine, please take the purchase invoice, maintenance card and the machine to the nearest Samsung service center and ask the service center staff whether the machine can be repaired if it has performance failure within the maintenance scope. If yes, the machine that can be repaired is genuine Samsung. This is the best and most accurate method.