"That's interesting. Thanks. Except the issue here is that I've told my phone not to ring if the incoming call isn't from a number in my contact list. That's a pretty strong block. These calls do ring, and they're not from numbers in my contact list. My phone DOES reject many calls that are not from numbers in my contact list. But, somehow, these few slip through. I'll admit that I quickly delete them and I really should be logging them in order to investigate further."
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Report this Phone Call and Other Phone Calls and Messages of the Like:
So, report phone call's and message's content to Apple and others (such as your government). Use my User Tip: Using the Photos App to Report Scams - User Tip
A. Blocking out Scam Calls with Malwarebytes:
I've been using the paid version of Malwarebytes for years --Rings seldom come through that are not on my Contact list, but that's because they are not being blocked. So, I report it to Malwarebytes, and they (the Developer) do some investigation. If found to be scam-related, they block it out for all out there. In essence, I'm helping all out there with Malwarebytes.
B. Blocking Out Messages:
And for the record, an app to use to filter out texts is called Bouncer. It Is a free application found in the App Store --it blocks out texts based on scenarios: keywords and keyphrases. Get it Here: Bouncer: Spam Text Blocker - App Store - Apple