1. Inquire through mobile phone settings: Settings-(General)-About Equipment-Model.
2. Take out the cell phone battery and check the cell phone model displayed on the label of the network access license.
3. Enter *# 1234# on the telephone keyboard.
4. Check the purchase invoice when buying a mobile phone.
5. Location of the outer packaging box of the purchased machine.
If you can't judge the above situation, you can directly consult the mobile phone dealer or send it to the nearest Samsung service station for inquiry.