Add button to block incoming caller
Context
A spammer got a hold of my number and began to dial me as 17804735822 (probably a fake number, set by some VoIP spoof, but who knows).
I hung up because this is a test number only right now, so it's easy to know it's not my friends.
Then, things got very humorless: the automated spammer called me back instantly when I hit hang up.
6 accursed times in a row.
I had to hard-power-off the phone to get back to my day-job.
Feature description
I would like a button somewhere around the "hang up" which blocks calls from the incoming caller. The button needs to be placed in such a way that it can be the first selection on the UI, or hanging up must perform a temporary block, otherwise spammers can pwn the user's time and attention.