A Japanese term for a worldwide technique
Wangiri (ワン切り) literally means "one (ring) and cut." An autodialer places a very high volume of calls, often through spoofed or international numbers, and hangs up automatically after a single ring. The goal isn't conversation — it's to generate a visible missed call, intriguing enough to make the victim call back voluntarily.
The callback trap
The number displayed is actually a premium-rate or revenue-share number. By calling back, the victim is connected to a line billed per minute at a very high rate — sometimes kept artificially on hold with a recorded message or music while the charges add up. This is a variant of International Revenue Share Fraud (IRSF), a scheme that profits both the operator behind the premium number and the organizer of the calling campaign.
What the FCC says
The FCC's guidance is direct: "Do not call back numbers you do not recognize, especially those appearing to originate overseas." Complaints can be filed for free with the FCC, and fraud reports can also be filed with the FTC at reportfraud.ftc.gov.
The premium-rate ranges this scam runs on
Wangiri is not an abstract threat: it runs on numbering ranges that regulators have explicitly designated as premium-rate, meaning the person placing the call is the one who pays. That is the whole mechanism — one ring, you call back, you are charged. In North America, two authorities define those ranges:
- United States — FCC: the 900 range.
- Canada — CRTC: the 1900 range.
Egidio ships with these ranges built in and applies them from the moment you install the app — no waiting for a number to be reported by anyone. A campaign that rotates through fresh numbers is still dialing from inside the range, so the coverage holds.
Wangiri
An automated single-ring call designed to trigger a voluntary callback from the victim to a premium-rate number.
Premium-rate number
A number billed at a high per-minute rate, often international, used as the callback destination.
IRSF
International Revenue Share Fraud: artificially generated traffic produces commissions paid back to the operator of the premium number.
What to do about a suspicious missed call
- Never call back an unknown number that rang only once.
- Check the country code before doing anything if the number looks foreign.
- Report it to the FCC (fcc.gov/complaints) or the FTC (reportfraud.ftc.gov).
Frequently asked questions
What does "wangiri" mean?
It's a Japanese term meaning literally "one (ring) and cut" (ワン切り). It describes the technique of calling and hanging up after a single ring, to lure the victim into calling back.
Why can calling back an unknown number be expensive?
The number displayed is often an international premium-rate number. By calling back, the victim is connected to a service billed per minute at a very high rate, sometimes kept on the line artificially with a hold message.
What should I do if I get a very short missed call from an unknown number?
Do not call back. Check the country code before taking any action if the number looks international, and report the scam to the FCC if you're in the US.
Related dossiers
Egidio — The Threat Laboratory, "Wangiri: the "one ring" phone scam", egidio.app/en/laboratoire/wangiri/. Licensed CC BY 4.0.
Free to reuse, including commercially, with attribution. Reuse terms.