One-Ring Wangiri Scams Extended via SMS
How one-ring missed calls are increasingly supplemented with SMS follow-ups that increase callback rates by adding urgency or a plausible context for the missed call.
Part of: One-Ring (Wangiri) Callback Scams
Last reviewed: 9 June 2026
The traditional one-ring wangiri scam relies on the recipient calling back a missed call from an international number. However, call-back rates have declined as awareness of the scam has grown. Scammers now supplement missed calls with SMS messages that provide a reason for the call, dramatically increasing the likelihood that the recipient will return the call to a premium-rate international line.
The SMS adds a layer of social engineering that turns an otherwise suspicious missed international call into what appears to be a legitimate — if unexpected — message requiring a response. Recipients who might have ignored the missed call are prompted by a text to call back, at which point they are connected to a premium-rate international line.
How this scam works on SMS
Within minutes of the missed call, a text arrives from the same or a different international number. It claims to be from a parcel delivery company ('We tried to deliver your parcel — call this number to rearrange'), a job recruitment firm ('Your application has been reviewed — please call to discuss'), a government department, or a personal contact claiming to be abroad.
When the recipient calls back to pursue what seems like a legitimate matter, the international premium-rate connection generates substantial charges per minute. The call may be answered by an automated service that attempts to keep the caller on the line as long as possible through hold music, menus, or vague responses. Some versions are more sophisticated, using a human to sustain the call under the pretence of a real conversation.
Common red flags
- Missed call from an unfamiliar international number followed quickly by an SMS with a callback prompt
- SMS creates urgency — parcel delivery, job offer, government notice — from a number you do not recognise
- Phone number is from a country code associated with known premium-rate routing (certain Pacific island, West African, or Caribbean codes)
- When called back, the line has unusual audio quality or extended hold music before connection
- Your phone bill shows a disproportionately high charge for a short international call
How to protect yourself
- Research any unfamiliar international number before calling back — use a reverse phone lookup site
- Do not call back international numbers from missed calls unless you were expecting a call from that region
- Use your carrier's international call blocking feature
- Report unfamiliar international missed-call and SMS combinations to your carrier
- Alert family members or elderly relatives to this scam pattern
How to report it
- Report to Ofcom (UK) or the FTC (US)
- Forward the SMS to 7726 to report to your mobile carrier
- Contact your carrier's billing disputes team if a large charge appeared from the callback
Frequently asked questions
How do I identify a premium-rate international number before calling?
Search the number online — many known wangiri numbers are documented in scam databases. Also check the country code: some small island nation codes are primarily used for premium-rate international routing rather than genuine personal calls.
My bill shows a large charge from calling back a missed call — can I dispute it?
Contact your carrier immediately and explain that the call was made in response to a wangiri scam. Some carriers will reverse the charge or credit a portion. The sooner you dispute it, the more likely a resolution is to be offered.