With Call barring on the LG smartphone it is possible to bar calls of a certain category. Both incoming and outgoing calls can be barred. As an example, all incoming calls can be barred if the device is abroad (roaming). It is also possible to create a whitelist, which means that calls can only be made with the entered phone number.

Note: A password (PIN) is required to edit the call barring function, which is set by the network operator; the PIN is usually 0000.

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  Call barring
  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 Call barring

LG Instructions