Your phone rings once and stops before you can answer, leaving a missed call from an unfamiliar international number. Curiosity says call back — and that is exactly what the scammer is counting on. This is the one-ring, or “Wangiri,” scam, and a single callback can cost you real money. Our GetMyPassword team explains how to recognize it.
How the scam works
Scammers use automated systems to ring thousands of numbers once and hang up, so each leaves a missed call from an unknown, often international, number. The name “Wangiri” means “one ring and cut” in Japanese, where the scam first spread. The number is a premium-rate line: if you call back out of curiosity, you are connected to a service that charges high per-minute fees, and the scammer keeps you on the line with hold music or a long recorded message. The cost lands on your phone bill, and the scammer takes a cut of the premium charge.
Red flags to watch for
- A single missed call from an unknown international number you do not recognize.
- No voicemail and no reason given for the call.
- Repeated one-ring calls from similar numbers, designed to prompt a callback.
- Unfamiliar country codes, sometimes resembling a domestic number at a glance.
- A callback that connects to hold music or a long, stalling recording.
Why a callback costs you
The trick relies on premium-rate numbers, the same billing model behind some paid hotlines — except here the “service” is worthless and the goal is simply to run up the meter. A few minutes on hold can translate into a surprisingly large charge, and because you placed the call, it appears as a legitimate dialed number on your bill. There is no prize, no message, and no real reason behind the call. The only purpose is to make you dial a number that bills you by the minute.
A number worth calling back leaves a voicemail. A single ring from a number you do not know is not a missed connection — it is an invitation to bill yourself by the minute.
How to protect yourself
Do not call back unknown international numbers; if it matters, the caller will leave a message. Block and report numbers that ring once and hang up, and ask your carrier about blocking premium-rate or international calls if these persist. Treat the call as you would a phishing text — a lure to be ignored. And keep your accounts behind a unique password from our password generator and two-factor authentication, so that no scam, by phone or otherwise, opens the door to them.
Frequently asked questions
What is the one-ring or Wangiri scam?
It is a scam where automated systems ring your phone once and hang up, leaving a missed call from a premium-rate number. If you call back out of curiosity, you are charged high per-minute fees while the scammer keeps you on the line.
Is it dangerous to call back a missed call?
Calling back an unknown international number can connect you to a premium-rate line that bills you by the minute. If a call matters, the caller leaves a voicemail. When in doubt, do not return calls from numbers you do not recognize.
What should I do if I keep getting one-ring calls?
Do not call back. Block and report the numbers, and ask your carrier about blocking premium-rate or international calls. Watch your phone bill for unexpected charges and dispute any that result from a callback.