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Call barring makes it possible to block calls when roaming is activated, for example.
In the same way, you can either block all incoming or outgoing calls on your Xiaomi smartphone. Call barring can be found in the phone settings, which has the following options:

Note: If dual SIM is used, we select the relevant SIM card first.

If a password is required, please request it from your network provider.

Android 11 | MIUI 12.0
Step 1: Tap on  Phone
Step 2: Open the  Menu
Step 3: Tap on  Settings
Step 4: Tap on  Calling accounts
Step 5: Tap on  Advanced settings
Step 6: Tap on  Call barring
Step 7: Choose a  SIM card   (Dual SIM)
Step 8: Turn On/Off an  Option
Step 9: Enter the  call barring password  and tap  OK
  1. Tap on Phone
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Calling accounts
  5. Tap on Advanced settings
  6. Tap on Call barring
  7. Choose a SIM card (Dual SIM)
  8. Turn On/Off an Option
  9. Enter the call barring password and tap OK
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Xiaomi Instructions