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Anonymous calls cannot be blocked because the Xiaomi smartphone cannot assign the caller ID or identifier. However, there is a remedy for this, as the device can automatically block all unknown calls, rejecting the caller and not establish a connection.

Android 11 | MIUI 12.0
Step 1: Tap on  Phone
Step 2: Open the  Menu
Step 3: Tap on  Settings
Step 4: Tap on  Blocked numbers
Step 5: Enable or disable  Unknown
  1. Tap on Phone
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Blocked numbers
  5. Enable or disable Unknown
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Xiaomi Instructions