Why spam calls come from your own area code
That call from a number two digits off from yours is not your neighbor. It's a boiler room wearing your area code as a costume — and it works far too well.
The trick
Caller ID was designed in an era when phone companies trusted each other, so the network largely displays whatever number the caller claims. Spammers exploit this by presenting a number that matches your area code and often your three-digit prefix — "neighbor spoofing" — because a local-looking number gets answered at dramatically higher rates. Your brain reads it as the school, the pharmacy, someone from town. That instinct is exactly what's being farmed.
Didn't STIR/SHAKEN fix this?
Partly, and honestly: less than promised. STIR/SHAKEN is the caller-authentication framework US carriers now run — calls get cryptographically attested by the originating carrier, and fully-attested calls are hard to spoof. The holes: a lot of scam traffic originates overseas or through small VoIP gateways where attestation is weak or absent, and an attestation only says "this carrier vouches the caller owns this number" — a scammer can legitimately own thousands of cheap VoIP numbers in your area code and rotate through them with full attestation. Real numbers, real attestation, still spam. That's why the labels help but the calls keep coming.
What actually defends you
- Treat local-looking unknowns as unknown. The area code means nothing. If it matters, they'll leave a voicemail.
- Never call back a missed unknown local number. Besides confirming your line, some of these are callback scams routed through premium-rate numbers.
- Turn on your carrier's neighbor filter. Verizon's neighborhood filter targets this exact pattern; AT&T and T-Mobile catch much of it in their fraud models.
- Screen by conversation, not caller ID. This is the structural fix: caller ID is unverifiable theater, but a conversation isn't. Spam Slayer ignores what the caller ID claims and tests the caller — a real neighbor passes in one sentence; a rotating-number boiler room gets Wilma, who has all afternoon.