With Fixed dialing numbers (FDN), only calls that have been added to a list can be made on the LG smartphone, and only calls from these numbers can be accepted. All other calls are automatically blocked.

Fixed dialing numbers can be switched on or off on the LG device and the list of allowed call numbers can be edited.

Android 9 (LG UX 9.0)
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Call settings
Step 4:  Tap on  SIM card 1  /  SIM card 2
Step 5:  Tap on  Fixed dialing numbers
Step 6:  Tap on  Enable FDN
Step 7:  Enter  PIN2  and tap on  OK
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Call settings
  4. Tap on SIM card 1 / SIM card 2
  5. Tap on Fixed dialing numbers
  6. Tap on Enable FDN
  7. Enter PIN2 and tap on OK

LG Instructions
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