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Glossary · Compliance

What is Wangiri (one-ring scam)?

  • Also called: one ring scam, one-ring call back scam

Reviewed by Sujan ThapaliyaLast updated

Definition

Wangiri is a scam where a call rings once from an unfamiliar international number and hangs up, hoping the recipient calls back. The return call routes to a premium-rate destination and the fraudster takes a share of the charge.
The three STIR/SHAKEN attestation levels, which underpin how wangiri (one-ring scam) behaves in practice: A asserts both that the carrier knows the customer and that the customer may use the calling number, B asserts the customer only, and C asserts neither. A shared number pool can reach B at best, which is why number ownership keeps recurring in these definitions.
Attestation is the backdrop to most caller-ID and deliverability terms, wangiri (one-ring scam) included.

In practice

How wangiri (one-ring scam) actually works

Caribbean numbers are heavily used because they sit inside the +1 dialling plan and look domestic to US and Canadian recipients. 809, 876, and 284 are the classic examples.

The defence is simply not returning calls to unrecognised international numbers, and blocking premium destinations at the PBX for business lines.

Businesses are hit differently from consumers. The exposure is not one curious person returning a call but a shared handset log, a receptionist working through missed calls, or an auto-dialer configured to retry unanswered numbers. Barring outbound calls to destinations you never do business with removes the whole category in one setting.

Worked example

A single ring at 3am from an unfamiliar international code, no message. Returning it connects to a premium-rate number billed by the minute, with the fraudster taking a share of the revenue.

Wangiri (one-ring scam): common questions

What is a wangiri scam?
A single ring from an international number, designed to make you call back. The number is premium rate, the fraudster takes a share of the revenue, and the cost lands on your bill. The name is Japanese for 'one ring and cut'.
What should I do if I get a one-ring call?
Do not call back. If it was genuine, they will call again or leave a message. If you want to verify, look the organisation up independently rather than returning the number that rang you.
How do businesses get caught by wangiri?
Through staff returning missed calls from company lines, often in bulk from a shared handset log. Blocking outbound calls to destinations you never do business with removes the exposure entirely.

Sources

  1. Combating Spoofed Robocalls with Caller ID Authentication — Federal Communications CommissionThe STIR/SHAKEN framework, the attestation levels carriers sign calls with, and the mandate requiring providers to authenticate caller ID.
  2. 47 U.S.C. § 227 — Restrictions on the use of telephone equipment — Cornell Legal Information InstituteThe Telephone Consumer Protection Act itself — the consent requirements, calling-hours limits, and private right of action.
  3. ITU-T Recommendation E.164 — The international public telecommunication numbering plan — International Telecommunication UnionThe international number format, the 15-digit maximum, and how country codes and national numbers compose.

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