If this feature is enabled on the Xiaomi device, the provider name of the SIM card is displayed in the lock screen.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Display
Step 3:  Tap on  Status bar
Step 4:  Enable or disable  Show carrier when device is locked
  1. Open the Settings
  2. Tap on Display
  3. Tap on Status bar
  4. Enable or disable Show carrier when device is locked

Xiaomi Instructions
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