Caller ID spoofing: why the name on your screen can lie

Caller ID feels authoritative — it’s right there on your screen before you answer. But it was never designed to be tamper-proof, and scammers exploit that every day.

How spoofing works

When a call is placed, the caller’s system supplies the number that should appear on your phone. Through internet calling, that value can be set to almost anything — a local-looking number, a bank’s real line, even your own area code. That’s “neighbor spoofing,” and it’s designed to make you trust the call.

The fix in progress: STIR/SHAKEN

Carriers are deploying a framework called STIR/SHAKEN that lets providers cryptographically verify that a caller ID matches the real originating number. The FCC describes it as a way to erode illegal spoofing and help phone companies label or block bad calls — but it’s a network-level defense, not a guarantee on every call.

What you can do

Treat caller ID as a hint, not proof. If a “bank” or “agency” calls unexpectedly, hang up and call the official number yourself. Pay attention to “spam likely” labels, and use a caller-ID app that adds a community signal on top of the raw number.