Your will display the mobile operator name on the lock screen at the factory. However, you can also hide the name of the mobile operator if you wish.
How this works in the Android settings of the Xiaomi Pocophone is explained here:
1. Open on the Xiaomi Pocophone the settings
2. Open here "notifications and status bar".
3. In the middle of the options you now see: Show mobile operator
4. Select the menu item and the following options will appear:
- Never show provider name
- Only show on lock screen
Selects now “Never show provider name” here, in order not to show the mobile provider on the lock screen anymore.