As mentioned above, there is no operator display in the upper left corner of the mobile phone, which is due to a display failure caused by abnormal mobile network.

The specific steps to solve the problem are as follows:

1. First, open the settings option on the main interface of the mobile phone. ?

2. After opening the settings page, select and click the "General" option, as shown in the figure below. ?

3. After entering the general interface, select and click the "Restore" option, as shown in the figure below.

4. After entering the restore interface, select and click the "Restore Network Settings" option, as shown in the figure below.

5. Then enter the personal mobile phone lock screen password according to the system requirements.

6. After restoring the network settings, long press the "power button" of the phone to shut down and restart.

7. Finally, the operator name in the upper left corner can be restored to normal display.