Here's how to block messages and send unwanted calls directly to Voicemail for your G8 ThinQ.
Open the
Phone app
on your LG G8 ThinQ
™.
From the Dial or Recent tab, tap the
Menu icon

.
Tap
Call settings
then tap
Call blocking & Ignore with message
.
Do any of the following:
Add Block
Tap the
Add icon

.
Tap one of the following:
Contacts
Call log
New number
Select a number from your Contacts, call log or manually enter a number then tap 'DONE' or 'BLOCK'.
Calls and messages from contacts or phone numbers added to the block list are automatically ignored. The call is forwarded to Voicemail and text / picture messages aren't delivered to the Messages app.
Remove Block
Tap the
Trash can icon

then select the contact you wish to unblock.
Allow ignore with message
Tap to turn on

or off

.
If turning on, select the appropriate message then tap
SAVE
.
When turned on, select a preferred message (e.g., Can't talk, text me).
Digit filter
Enter a 3 or 4-digit number.
Tap Match condition then select one of the following:
Tap
Private numbers
to turn on or off.
If calls from specific numbers go directly to Voicemail but you're still able to receive text messages, ensure the contact isn't set to automatically route to Voicemail by navigating to (active when checked).