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 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  Fixed Dialing Numbers
Step 6:  Choose  SIM-Card  you want
Step 7:  Tap on  Enable FDN
Step 8:  Enter  PIN2  and confirm with  Save
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Carrier call Settings
  5. Tap on Fixed Dialing Numbers
  6. Choose SIM-Card you want
  7. Tap on Enable FDN
  8. Enter PIN2 and confirm with Save

Oppo Instructions
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