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A comment on FCC will require phone carriers to authenticate calls by June 2021 [pdf]. Parent comment

Re:FCC will require phone carriers to authenticate calls by ... by gruez on Tuesday March 31, 2020 @06:27PM (#22743410)
>While this is a possible scenario- in my experience most people know to call multiple times - especially if they know that the recipient won’t recognize the number.

I'm surprised robocallers don't do this too

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Re:FCC will require phone carriers to authenticate calls by ... by jon_richards on Tuesday March 31, 2020 @06:46PM (#22743581)
Calling once selects for people more likely to fall for the actual scam.
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Re:FCC will require phone carriers to authenticate calls by ... by yellowapple on Tuesday March 31, 2020 @07:00PM (#22743694)
Also, spamming/scamming in general is a numbers game. It's generally more profitable to move onto the next number on the list than to keep retrying.
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Re:FCC will require phone carriers to authenticate calls by ... by gumby on Tuesday March 31, 2020 @07:24PM (#22743893)
They do
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