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A comment on T-Mobile says it blocked 21B scam calls this year. Parent comment

Re:T-Mobile says it blocked 21B scam calls this year by lolinder on Tuesday December 21, 2021 @10:02AM (#29638000)
Most calls I get have my local area code, sometimes even the same first 6 digits. You can't just block phone numbers because phone numbers are self-reported. Spammers will just keep switching.
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Re:T-Mobile says it blocked 21B scam calls this year by _jal on Tuesday December 21, 2021 @10:15AM (#29638133)
I get a lot of that too. I haven't lived in the geographical region associated with my area code in over a decade, so I don't actually know anyone with the same prefix.

So they may as well use "I am a spammer" as their Caller ID.

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Re:T-Mobile says it blocked 21B scam calls this year by profmonocle on Tuesday December 21, 2021 @10:20AM (#29638174)
I saw something interesting the other day. This company called me twice within a few minutes. The first call came from "+1 844-###-####", but it was automatically blocked as spam by Android. The second call was from the same number, but it was formatted as "+844#######". That one wasn't blocked.

I wonder if formatting the number this way allows them to circumvent spam lists, but doesn't trip anti-caller ID spoofing mechanisms?

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