I’ve noticed two main things about the many robocalls/spamcalls I’ve received (my carrier actually has spam blocking, and I haven’t received very many since activating it)
1. Most calls I receive from numbers not in my contact list are spam. They also usually just call once, whereas if it’s a legit call that I was expecting, but neglected to pick up, they’ll call again within a few minutes.
2. I’ll get robocalls from one area code at a time. I remember getting calls from 772 one week, 727 the next, 643 a few days later, etc.
Obviously it won’t crush spam entirely, but I can imagine that fixing even just these two things would filter out a boatload if spam from reaching consumers.
Oh, and calls from “Scam Likely” should never reach my phone to begin with.
Comments
I’ve noticed two main things about the many robocalls/spamcalls I’ve received (my carrier actually has spam blocking, and I haven’t received very many since activating it)
1. Most calls I receive from numbers not in my contact list are spam. They also usually just call once, whereas if it’s a legit call that I was expecting, but neglected to pick up, they’ll call again within a few minutes. 2. I’ll get robocalls from one area code at a time. I remember getting calls from 772 one week, 727 the next, 643 a few days later, etc.
Obviously it won’t crush spam entirely, but I can imagine that fixing even just these two things would filter out a boatload if spam from reaching consumers.
Oh, and calls from “Scam Likely” should never reach my phone to begin with.
The first rule would have a short half-life, spam systems would just learn to call again.
The rolling area codes you observed are already an anti-banlist mechanism.
Maybe a loose superposition of short half-life rules would work, like it works for email spam.