The phone app on the OnePlus smartphone includes a feature to set up a call restriction and allow only specified phone numbers to be called or to make calls themselves.

This function serves as a safety feature when setting up a smartphone for children, for example.

After successful activation the allowed phone numbers can be entered in the same menu item.

Note: In order to FDN, the PIN2 is required, which can be found in the documentation of the SIM card.
Otherwise please contact the network provider support.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Phone app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Call accounts
Step 5:  Choose a  SIM card   (Dual SIM)
Step 6:  Tap on  Fixed Dialing Numbers
Step 7:  Tap on  Enable FDN
Step 8:  Enter the  PIN2  and tap  OK
  1. Open the Phone app
  2. Open the menu
  3. Open the Settings
  4. Tap on Call accounts
  5. Choose a SIM card (Dual SIM)
  6. Tap on Fixed Dialing Numbers
  7. Tap on Enable FDN
  8. Enter the PIN2 and tap OK

OnePlus Instructions
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