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
Call barring -  Open the  Phone -App
Call barring -  Open the  Menu
Call barring -  Tap on  Call settings
Call barring -  Tap on  SIM card 1  /  SIM card 2
Call barring -  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