or the message app,

although the exact process

will depend upon your device model.

We will be using the LG V40 ThinQ phone for this demo.

Whichever device you have, the result will be the same.

They won't be notified,

and they won't know for sure that you've blocked them.

To block a number through the phone app,

open the phone app.

For this phone, you will need to be

on the dial or call logs page.

Tap the three dots in the top right corner,

select "Call settings,"

and then tap "Call blocking & Decline with message."

Tap "Blocked numbers."

Tap the small plus sign

to add the number you want to block.

A window pops up for you to choose how to add the number.

You can choose from one of your existing contacts,

choose from your call logs,

or enter a new number to be blocked.

To block a number through the message app,

open the message app.

Tap the three dots in the top right corner,

select "Settings,"

then tap "Message blocking."

Tap "Blocked numbers,"

then follow the previous steps of tapping the plus sign

and choosing how to add the number you want to block.

Note that when you block a number on the LG model,

you won't get calls or texts from them anymore,

but you retain the option to call or text them.

Also, if you want to block your own number

and hide your caller ID when calling others,

type *67 before the phone number you're dialing.