How caller ID spoofing works
Your screen shows your bank or a relative's number, but a scammer is on the other end. Here's how caller ID gets faked — and why it's still possible.
What caller ID spoofing is
Caller ID spoofing means substituting an arbitrary number into the field your phone shows as "who's calling." Technically, the call often runs over internet telephony (SIP/VoIP), where the sender specifies the outgoing number themselves, and the network doesn't always verify it before connecting the call.
Why scammers do it
A spoofed number that matches your bank, a government agency, or a relative builds trust: the victim answers and is more willing to follow instructions from a fake "security officer." Spoofing is also used to dodge blocks — once one number gets reported as spam, scammers quickly switch to the next.
What it looks like in practice
Banks, delivery services, government bodies, and even your relatives' numbers get spoofed most often — sometimes even showing the saved contact name. Caller ID alone isn't proof of anything: it displays whatever was sent to it, not who's actually calling.
How to protect yourself
- Never read out an SMS code or follow a link during a call — no bank ever asks for that
- Hang up and call back using the number from the bank's official website or the back of your card
- Be wary of calls that rush you or create a sense of urgency
- Check the number on KtoTam.to — mass complaints show up immediately
- Turn on spam and verified-caller detection in your phone settings if your carrier supports it