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Incoming calls that do not transmit a phone number or send no identification can be rejected or blocked directly by realme smartphone.

Android 11 | realme UI 2.0
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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realme Instructions