Taking Huawei mobile phones as an example, we can set up mobile phone operators by changing the "notification bar and status bar". The setup steps are as follows:

1, we turn on the phone, find the settings in the phone menu, and click Enter.

2. After entering, slide down the page, find the notification bar and status bar, and click Enter.

3. After entering, we can see that if the operator's name is displayed, we can see the operator in the upper left corner.

4. We click Close to display the name of the operator, and the operator disappears in the upper left corner of the screen.

In addition, we can set the operator by turning on the flight mode. Click the flight mode switch, and then turn off the flight mode. When the search is completed, we can see the logo of the operator.