Unknown Senders Function in Messages NOT working!

I believe like Demo suggests you are confusing iMessage with SMS messages. iMessage is exclusively through Apple Servers. SMS messages come through your carriers servers. Apple has total control over data flowing to and from its servers. Apple has NO control over data flowing through a carriers servers.

The reason you believe the software doesn't work is Apple can't control data coming to you from your carrier. You should reach out to your carrier and let them know you think they should do a better job of filtering messages from Unknown Senders. I have done that myself. But I don't blame Apple for something out of their control.

As far as I know, filter unknown senders only works with iMessages and not SMS messages. Is that what you are seeing?

iMessages from iPhones, iPads, iPod Touches or Macs. See the response that got an Apple recommenced award here.

Filter Unknown Senders not working

Many services use SMS messages to contact people for variety of reasons, like getting a verification code sent to a device that comes over as an SMS. If those messages couldn’t come over because it was from an unknown sender, you would never get the code.