Blocking numbers is pretty useless. The number you see on the called ID most of the time is NOT the number they call from. Number spoofing is an epidemic now and many times if you block a number, it might be completely not involved in the call, it was just spoofed. And a few minutes later, they can call you from another, spoofed number. This needs to be addressed by phone providers (not sonic, higher up the chain) by adding number authentication to prevent spoofing. Until this is done, nothing will work.
Not completely true. I often get multiple calls from the same number, spread over a period of days or weeks. Even if it's spoofed, blocking that number will block the numerous repeat calls. Also, several other people get calls from that number before the scammers stop using it and move on to another number. So blocking specific numbers will make a difference, even if it doesn't solve every situation.
Actually, blocking spoofed numbers can prevent legit phone calls.
What if they decide to use your number, and pretend you are calling me, and as a consequence I ask it to be blocked?
You would never be able to call me anymore (nor all the others who would be shielded from that number).
Blocking numbers will be useful again once we can guarantee that spoofed calls are already blocked.