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NumBan
Report voicemail callback numbers, not spoofed caller ID.
NumBan is the first app to combat phone scammers using the number they leave on your voicemail, which cannot be faked. Most apps block the caller's phone number, which is a spoofed caller ID. Users can simply share the voicemail with NumBan and our system will transcribe it, extract the number, look up the phone carrier, and report the number to their abuse team. When we detect that a number has been abandoned, we count it as a kill and increment our leaderboard!
Hey Product Hunt 👋
I'm Ammon. I built NumBan because I got tired of dozens of scam calls per week that leave me voicemails for scams. I can't answer unknown numbers any more (and they automatically go to voicemail now, too).
Blocking doesn't work because caller ID is fake. But every scam voicemail has one thing that isn't fake: the number they want you to call back. It has to ring a real phone somewhere, which means some carrier is hosting it.
So NumBan goes after that number. You share the voicemail from your Phone app, and NumBan:
- pulls the callback number out of the audio
- figures out which carrier or toll-free provider hosts it
- sends them an abuse report once enough people have reported the same number
- pings the number every week until it's dead and notifies you of your good work
Dead numbers count as kills and go on a leaderboard. The leaderboard counts kills, not reports, so you can't farm it by sharing the same voicemail fifty times.
The fun part of building this was finding out how hard it is to learn who owns a phone number. Toll-free numbers, which is what most scammers leave, live in a registry you can't just query with an API key. That turned into a long detour through RespOrgs, porting databases, and a legacy phone systems.
Right now reporting is free for the first three, then I have to cover costs so I charge the App Store minimum $0.99 per month.
I'd love to hear two things: does the leaderboard make you more likely to report, and what's the most ridiculous scam voicemail you've ever gotten?
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About NumBan on Product Hunt
“Report voicemail callback numbers, not spoofed caller ID.”
NumBan was submitted on Product Hunt and earned 5 upvotes and 1 comments, placing #36 on the daily leaderboard. NumBan is the first app to combat phone scammers using the number they leave on your voicemail, which cannot be faked. Most apps block the caller's phone number, which is a spoofed caller ID. Users can simply share the voicemail with NumBan and our system will transcribe it, extract the number, look up the phone carrier, and report the number to their abuse team. When we detect that a number has been abandoned, we count it as a kill and increment our leaderboard!
NumBan was featured in iOS (110.9k followers), Social Impact (3.2k followers) and Security (2.9k followers) on Product Hunt. Together, these topics include over 47.4k products, making this a competitive space to launch in.
Who hunted NumBan?
NumBan was hunted by Ammon Brown. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how NumBan stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Ammon Brown