Caller ID
Definition
The number, and sometimes a name, displayed on your phone when someone calls you.
Caller ID, explained
Caller ID is the information your phone shows for an incoming call: the calling number and, on some networks, a name. In the US and Canada the name may come from a caller name database maintained by carriers, while many smartphones also add labels such as 'Spam likely' from their own filtering. Caller ID can be faked. Scammers often spoof numbers that look local or that copy a real company's number to make you answer. To push back on this, US and Canadian carriers use an authentication framework known as STIR/SHAKEN, which lets networks verify whether the caller is allowed to use the number shown, and UK regulators have introduced rules to block calls with invalid or spoofed numbers. These measures reduce, but do not eliminate, spoofed calls. A legitimate company will not call to ask for a verification code you just received. If a caller asks for one, hang up and contact the company through its official app or website.
Related terms
Sender ID spoofing
Faking the name or number shown as the sender of a text so a scam message looks like it came from a trusted source.
Voice verification
Confirming a phone number by answering an automated call that reads you a one-time code.
Smishing
Phishing by text message: a fake SMS that tries to get you to click a link, share a code or send money.
Where you'll meet this term
How to Stop Spam Texts and Calls (US, UK and Canada)
Cut down spam texts and calls: forward to 7726, use carrier and phone filters, join Do Not Call lists, and keep your number off sign-ups.
Read the guide →TroubleshootingSMS Code vs Phone Call Verification: What's the Difference?
When to choose a text code or a phone call for verification, why apps offer "Call me", and what to do if your number can only receive SMS.
Read the guide →