Caller ID Spoofing: Why the Number Can Lie

Caller ID is a label the caller's system supplies. It can be set to nearly anything, including your own number.

What spoofing is

Internet phone systems let a caller choose which number appears on your screen. Legitimate businesses use this to show a main line. Scammers use it to show a bank, a government agency, or a number that looks like yours. Under the Truth in Caller ID Act it's illegal to spoof with intent to defraud or cause harm.

Neighbor spoofing

If a call comes from your own area code and prefix (the first six digits), it's probably neighbor spoofing: the scammer copies your local numbers because you're more likely to pick up. Real neighbors exist, but a stranger who matches your number's first six digits is a warning sign.

What verification badges mean

Carriers use a system called STIR/SHAKEN to check that the calling number wasn't altered on its way. A "verified" mark means the carrier believes the caller is entitled to use that number. It doesn't mean the caller is honest, and calls that cross carriers or come from abroad may not be verified at all.

How to protect yourself

Treat caller ID as a hint, never as proof. A real bank's number can be spoofed.
If a call claims to be from an organization, hang up and call back using the number on its website or the back of your card. Check our list of official numbers.
Don't press a number to be removed from a list, and don't say anything that could be recorded as consent.
Use your carrier's free scam-call filter and silence unknown callers if you can. See how to block and report.

Unassigned prefixes are one clue we check: if the first six digits aren't assigned to any phone company, no real line can have the number. That's a sure sign of a fake, and the lookup flags it.

Sources

Reviewed October 2026. Rules and scam tactics change; check the official pages for the latest.

Check a number

Got a number you don't recognize? Look it up to see where it started and whether it looks risky.