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

Android 10 | ColorOS 7.0
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Settings
Step 4:  Tap on  Carrier call Settings
Step 5:  Tap on  Call Barring
Step 6:  Choose  SIM-Card  you want
Step 7:  Enable or Disable  Call Barring  you want
Step 8:  Enter the  Network Password
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Carrier call Settings
  5. Tap on Call Barring
  6. Choose SIM-Card you want
  7. Enable or Disable Call Barring you want
  8. Enter the Network Password

Oppo Instructions
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