Wangiri (One-Ring Callback Fraud)

Also known as: One-ring fraud, Callback fraud

Wangiri (Japanese for 'one ring and cut') is a telecom fraud in which attackers place very short calls from international premium-rate numbers to large volumes of subscribers, hoping that recipients will call back the missed number. The callback terminates on a premium-rate range controlled by the fraudsters, generating revenue share paid out through the international settlement chain before the victim's operator can block the range.

Categories: Threats and AttacksFraudOperations and Business

Wangiri in context

Telecom threats range from opportunistic SMS phishing and SIM swap to nation-state grade location tracking and lawful-interception abuse. The common thread is that most attacks exploit the inherited trust model of legacy signaling. SS7 and Diameter were designed for a closed operator community that no longer exists.

Telecom fraud costs operators an estimated $40+ billion per year. Common vectors include International Revenue Share Fraud (IRSF), Wangiri callback scams, SIM box bypass, PBX hacking, subscription fraud and A2P grey routing. Effective defense combines real-time signaling analytics with CDR-side machine learning.

To place Wangiri in the wider telecom-security picture, review Flash Call Fraud, Wangiri 2.0, Billing System, PBX Hacking, PBX Dial-Through Fraud and Revenue Share Fraud.

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