Excuse me, Samsung mobile phone often has a shell, and refuses to apply for authorization. How to solve the mobile phone card?

1. Uninstall the recently installed third-party software.

2. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ), restore the factory settings (enter phone settings-reset-restore factory settings) and try again.

3. If there are still problems through the above methods, please bring the purchase invoice, maintenance card and machine to Samsung Service Center, and the engineer will check and handle the machine.