This won’t work.
Scenario: you do business with a company. They have several phone lines. They call you back from a number that you were not aware they had. The call is blocked. Stupid. Dense. Moronic.
Scenario:
Your child is out with friends and needs assistance, and calls you from a friend’s phone, a store’s phone, or some other phone that you don’t know.
Also, the telemarketers use fake numbers, one of which CAN be from a number on your “white list.”
Blocking numbers by default is not the solution.
My concern exactly.
This proposal is not a workable solution.
I don’t think they would block a number just because they aren’t familiar with it.
But there are known spam numbers and they can block those.
That's not what this is about. It is about developing technology to determine that a call is not masquerading as another number. It's about authenticating numbers: https://transnexus.com/whitepapers/stir-and-shaken-overview/ That means a number that you don't know still gets through but it can't pretend to be a different number. And if that original number is on a block list (only) then the call will be blocked.