What is Wangiri Fraud?
A call from an unfamiliar number comes into your cellphone, rings once and disconnects. It looks innocuous, like a simple mistake. However, it may actually be more sinister. You may have been targeted by a "Wangiri" attack, Japanese for "one ring and drop" — a one-ring scam campaign that began in Japan.
In Wangiri fraud, a scammer places a robocall to a mobile number (the target subscriber) and hangs up after one or two rings. They often do so more than once intending on getting the person to call back. Some use an SMS to achieve the same goal. This is the first "leg" of the Wangiri attack.
In Wangiri fraud scammers manipulate the A-number field (the CLI) to display the same number for the calls, usually a hijacked number or a premium/high-rated destination number on an International Premium Rate Service. If the target subscriber does call back, they have unwittingly dialed an obnoxiously expensive number.
Usually, they then hear an adult-oriented or lottery win/gambling recording that serves as a pretext to keep the caller on the line as long as possible. The victim is saddled with expensive fees, some of which are paid to the scammer. This is the second "leg" of the Wangiri attack.