1. Unlock the iPhone to the phone desktop, and the network status at the top shows no service. Open the settings.
2. After entering the option list of mobile phone system settings, find the general settings.
3. Enter the bottom of the general menu bar and select the recovery function to proceed to the next step.
4. Jump to the management page of reset settings, and click Reset Network Settings (Reset Network Settings is the operation of initializing the mobile phone network mode, and will not affect other data).
5. Before restoring the network settings, please manually enter the password for verification and authorization according to the system requirements.
6. After restoring the network settings, press and hold the power button on the right side of the iPhone to restart the phone.
7. After the restart of network settings takes effect, the operator activation page appears on the mobile phone screen, and click Accept at the bottom.
8. Unlock the iPhone to the mobile phone desktop, and the service status of the operator will return to normal.