How does Samsung s7 distinguish between true and false?

First, query the 15 digit IM code of the mobile phone, and then directly enter * # 272 * IMEI # on the keyboard. After the input is completed, it will jump to the version query interface. Behind the sales code is the version code we want to query, for example, CHN stands for mainland licensed goods. Other common codes are: RGS is Canada, ELS is Finland, OFR is France, DBT is Germany, TGY is Hong Kong, Pan is Hungary, GOM is Italy, DCM is Japan, SKT is Korea and TWM is Taiwan Province Province. BTC is Britain and AWS is America.