Call waiting is a function where a further incoming call is announced acoustically while a phone call is already in progress. As you can guess by the name, the further caller can be heard by knocking noises.

Note: The call waiting function is enabled or disabled by default according to network settings. On the LG smartphone, call waiting can be enabled or disabled in the phone settings.

Note: If call waiting is deactivated, the caller is rejected directly or, if activated, diverted to another phone number/mailbox.

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  Other settings
Step 5:  Enable or Disable  Call waiting
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Call settings
  4. Tap on Other settings
  5. Enable or Disable Call waiting

LG Instructions