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Re:FCC orders phone companies to help trace illegal robocallers by throwaway314158 on Thursday December 31, 2020 @03:29PM (#25596783)
If you go to Settings > Messages, you can filter out messages from unknown senders. However, this only prevents the notifications from showing up; they'll still be in the app under the "Unknown senders" tab.

FWIW, T-Mobile does allow you to block all SMS and MMS.

Re:FCC orders phone companies to help trace illegal robocallers by diebeforei485 on Thursday December 31, 2020 @04:29PM (#25597364)
There is also a Screen Time feature called Communication Limits which can be used to restrict Messages and Phone to contacts only. Doesn't apply to third-party apps though.