One-ring (Wangiri) call-back scams
Robocalls ring once from international premium-rate numbers, often late at night, to provoke curiosity-based callbacks. Calling back connects to expensive pay-per-minute services with the charge split between the carrier and the scammer. Never call back unfamiliar single-ring numbers.
What we know
Wangiri is Japanese for 'one ring and cut.' The scam originated in Japan in the early 2000s and has spread globally. The mechanism exploits the pay-per-minute economics of premium-rate phone numbers (similar to old 1-900 numbers) in certain countries. Fraudsters program auto-dialers to call millions of mobile numbers and disconnect after a single ring - just long enough for the number to appear in missed calls, but too short for the recipient to answer.
When a recipient calls back out of curiosity, concern, or mistaken identity, they are connected to a premium-rate number in West Africa (particularly Mauritania's 222 country code), the Caribbean, or other regions with high international calling rates. The call may play a long recorded message, hold music, or an operator who prolongs the call. Per-minute charges accumulate, often from $10 to $30 per minute, and a portion flows to the scammer through the premium-rate revenue sharing arrangement.
The FCC issued an alert in 2019 noting a surge in one-ring calls targeting the U.S. from Mauritanian and other foreign numbers. The Pallone-Thune TRACED Act (2019) directed the FCC to enact specific one-ring scam protections. Carriers may now block numbers associated with known Wangiri patterns. The defensive guidance is simple: do not call back any single-ring missed call from an unfamiliar international number. If you are uncertain whether a missed call was legitimate, search the number before calling back.
Common claims
- I should call back a missed call even from an unknown international numberRisky - one-ring scam numbers are designed to be called back
- Calling back costs only my regular call rateFalse - calls to premium international numbers incur large per-minute charges
- My carrier will block Wangiri callsPartially true - carriers can block known patterns but cannot block all variations