Phone number validator
Paste a phone number from a form fill or sign-up. See whether it's valid for its country, a known fake like 555-0100, and whether it's a mobile, landline, VoIP, toll-free, or premium-rate line.
Published Updated
Catch fake phone numbers at the form, not on the sales call.
GoodInbound is a form backend and lead screen for any form. It:
- Screens every submission for bots, fake sign-ups, and unsolicited sales pitches, whether a person or an AI wrote them.
- Labels each one lead, review, spam, junk, or bot, with a one-line reason.
- Enriches real leads and notifies you by email, Slack, or Telegram.
- Sends only real leads on to your CRM, workflows, and ad platforms.
What the validator checks
- Format and length: whether the number fits its country's numbering plan, in more than 200 countries and territories.
- Fake numbers: one digit repeated, straight runs like 1234567890, and ranges set aside for film and TV, such as 555 numbers in North America and Ofcom's drama numbers in the UK.
- Line type: mobile, landline, VoIP, toll-free, or premium rate, wherever the country's numbering plan says.
- Country: where the number is registered, read from its country code, or from your location for a number typed without one.
Why US and Canadian numbers show "mobile or landline"
North American numbers don't encode the line type: a mobile and a landline in the same area code look alike. Telling them apart, and spotting VoIP numbers such as Google Voice, takes a lookup in the carrier routing database. GoodInbound Lead Screen does that lookup for every US and Canadian number on the forms it screens.
Fake, risky, or fine?
- Fake: an invalid number, repeated or sequential digits, or a 555 number. Often a real person who doesn't want calls, so weigh it with the rest of the submission.
- Risky: VoIP numbers, premium-rate lines, and a number from a different country than the person filling in the form. Worth a second look on a demo request.
- Fine: a valid mobile or landline that fits the rest of the lead.
Questions
Check that it's valid for its country and isn't a known fake pattern like 555-0100 or 1234567890, as this tool does. For US and Canadian numbers, a carrier lookup also shows whether it's a VoIP number such as Google Voice, which fake sign-ups use often.
No. It checks the number against its country's numbering plan, not the live network, so a valid number can still be disconnected. That's why lead screening weighs the number with the email address, how the form was filled in, and the network it came from.
No. Business phone systems like RingCentral and Zoom Phone use VoIP numbers too. Free VoIP apps are popular with fake sign-ups, so treat a VoIP number as a flag, not proof.
No. The number is checked and the result is returned. Nothing is saved.
Up to 100 a day. To check the phone number on every form submission automatically, with carrier lookups for US and Canadian numbers, use GoodInbound Lead Screen.
Yes. With a free GoodInbound account, send form fields to the Lead Screen field check endpoint, or use the check_contact tool in the GoodInbound MCP server, and get the phone facts back alongside the email checks.