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Number restriction allows you to block outgoing calls (except for emergency calls), while incoming calls are unrestricted. Number restriction (FDN) on the Oppo smartphone must be activated using PIN2. You can also create a list of phone numbers that are allowed for calling.

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  Fixed dialing numbers
Step 7: Choose a  SIM card   (Dual SIM)
Step 8: Tap on  Enable FDN  and follow the instructions on screen
  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 Fixed dialing numbers
  7. Choose a SIM card (Dual SIM)
  8. Tap on Enable FDN and follow the instructions on screen
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Oppo Instructions