NumBan helps identify and report scam callback numbers. Users share a voicemail from their Phone app, check the callback details, and follow reported numbers for status changes. Confirmed kills rank them on a leaderboard.

What happens when I report a number?

NumBan pulls the callback number from the voicemail and reports it to the carrier. The user's personal email is never included. NumBan then checks the number weekly and notifies the user when it becomes disconnected.

Is my voicemail audio shared publicly?

No. Voicemail audio, screenshots, and recognized screenshot text are kept as private report data and are not published. Public number pages show only aggregate, redacted details such as report counts, carrier information, and scam type.

How does NumBan verify scam numbers?

NumBan transcribes the shared voicemail audio on its servers and extracts possible callback numbers. You can share an uncropped screenshot after the audio; NumBan attaches it to a matching voicemail, or you choose the voicemail in the app. A screenshot is not filed as its own report. If the callback number is not clear, you confirm it before it is reported.

Cybersecurity

NumBan

Hit them in the numbers

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An app that helps people report scam voicemail callback numbers to carriers without sharing their personal email.

Overview

A look at numban.com

NumBan helps identify and report scam callback numbers extracted from voicemail. Users share a voicemail from their iPhone's Phone app, and NumBan transcribes the audio to extract the callback number. The app then prepares and files a verified complaint with the carrier that hosts the number, while keeping the user's personal contact information private. NumBan re-checks reported numbers weekly to track when they become disconnected, confirming a "kill" when the number is no longer routable after abuse complaints are filed. Confirmed kills are ranked on a public leaderboard.

Feature notes

Voicemail transcription and callback number extraction
Automatic carrier abuse report filing
Weekly number status re-checking
Kill tracking and confirmation
Public leaderboard ranking
Optional screenshot verification
Private data storage
Relay email address for reporting

Pricing

Pricing model: Freemium

NumBan Pro Yearly — $9.99 USD (or the equivalent shown in the App Store for your region)

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NumBan at a glance

Community votes: 0
Followers: 0
HQ: United States

NumBan metrics

Inspection sheet for numban.com: Ahrefs Domain Rating and Majestic link metrics, with the delta since the last inspection.
Metric	Value
Domain Rating	0 no change since last check
Trust Flow	1 no change since last check
Citation Flow	24 no change since last check
Referring domains	14 no change since last check
External backlinks	49 no change since last check

Domain Rating by Ahrefs inspected 7 Nov 2026, adjusted 25 Oct 2026. Primary topic: Arts/Performing Arts (1). Majestic inspected 25 Oct 2026, adjusted 25 Oct 2026. Link data: Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

NumBan domain diagnostics

Run through the diagnostics

Public RDAP record, last read 7 Nov 2026, 04:39 UTC.
Domain age	5 months
Registered	4 Jun 2026
Expires	4 Jun 2027
Registrar	Cloudflare, Inc.
DNSSEC	Not signed

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NumBan post-launch diagnostics

Measured after NumBan went live on Launching Pro on 25 October 2026.

Domain Rating (Ahrefs): 0 no change since launch; 0 at launch (25 Oct 2026), 0 on 7 Nov 2026
Trust Flow (Majestic): 1; First measured 25 Oct 2026
Referring domains (Majestic): 14; First measured 25 Oct 2026

Day 12 since launch. Next receipt: day 30, 24 Nov 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.

Biggest gains on Launching Pro

Launch tips, free to read

The playbook on Launching Pro lists what to prepare, what to post on launch day and where else to list your product.

Before the day
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FAQ

What is NumBan?: NumBan helps identify and report scam callback numbers. Users share a voicemail from their Phone app, check the callback details, and follow reported numbers for status changes. Confirmed kills rank them on a leaderboard.
What happens when I report a number?: NumBan pulls the callback number from the voicemail and reports it to the carrier. The user's personal email is never included. NumBan then checks the number weekly and notifies the user when it becomes disconnected.
What is a kill?: A kill is confirmed when a reported callback number becomes disconnected or is no longer routable after abuse complaints are filed. NumBan re-checks weekly and counts confirmed kills on the leaderboard.
Is my voicemail audio shared publicly?: No. Voicemail audio, screenshots, and recognized screenshot text are kept as private report data and are not published. Public number pages show only aggregate, redacted details such as report counts, carrier information, and scam type.
How does NumBan verify scam numbers?: NumBan transcribes the shared voicemail audio on its servers and extracts possible callback numbers. You can share an uncropped screenshot after the audio; NumBan attaches it to a matching voicemail, or you choose the voicemail in the app. A screenshot is not filed as its own report. If the callback number is not clear, you confirm it before it is reported.

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