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With call barring, incoming or outgoing calls can be specifically barred, including

Android 11 | ColorOS 11.0 | Google Phone
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  Carrier call settings
Step 6: Tap on  Call barring
Step 7: Choose a  SIM card   (Dual SIM)
Step 8: Turn On/Off an  Option
  1. Tap on Phone
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Calling accounts
  5. Tap on Carrier call settings
  6. Tap on Call barring
  7. Choose a SIM card (Dual SIM)
  8. Turn On/Off an Option
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