topic Real Phone Number Validation in APIs & Integrations

Real Phone Number Validation

yhernandez — Thu, 09 May 2019 20:42:14 GMT

In a lead form, I need validate that the phone number enter by user is a real US phone number. Not just check if have the the 10 digits format but the area code is right too. Hubspot provide any integration for acomplish that? I'm doing some research but I can't find anything related to this and I think that put some js code into the form is not the right way to do it. Any feedback and suggestion are welcome. thanks!

Re: Real Phone Number Validation

IsaacTakushi — Mon, 13 May 2019 17:05:43 GMT

Welcome, @yhernandez.

At this time, there are no existing HubSpot integrations or services which can validate phone numbers client-side.

In the past, I've recommended users custom code a form and make AJAX calls to an external validation service (e.g. numverify) before submitting the data to the v3 Forms API. (Customizing a form's embed code does not afford such flexibility.)

Re: Real Phone Number Validation

yhernandez — Mon, 13 May 2019 17:14:54 GMT

Hi @IsaacTakushi ! thanks for the response and the approach. If would be great if some how the platform can provide some kind of integration for this scenarios(For example Zapier provide and 3rd Party Integration with RealPhoneValidation API maybe that would be an option for the platform).

Best!

Re: Real Phone Number Validation

IsaacTakushi — Tue, 14 May 2019 14:23:59 GMT

I hear you, @yhernandez. Appreciate the feedback!

Re: Real Phone Number Validation

leesuker — Tue, 21 May 2019 12:03:36 GMT

This is one of XConnect's core services. We would love to work with Hubspot to make this native functionality.

www.xconnect.net/number-validation

Re: Real Phone Number Validation

JCreedon2 — Thu, 27 Jan 2022 19:03:51 GMT

Is this availble yet?

Re: Real Phone Number Validation

rachaelsink — Tue, 12 Nov 2024 21:03:41 GMT

Has there been any changes to this ask since 2019? I have a HubSpot customer asking me of this same request.

Re: Real Phone Number Validation

K_Foster — Wed, 11 Dec 2024 20:25:53 GMT

Hi rachaelsink! Not sure if HubSpot has released anything natively but there are 3rd party app integrations you can us.

We installed Real Contact Phone Grading HubSpot app by Trestle. The app can do a phone validation check, grade contact details, and email deliverability check all in one query! The Phone Activity Score is a very helpful data point to determine connected/disconnected phone line status.

To connect the HubSpot app with Trestle, you will need a Trestle API key which you can get for free here (link to sign up). Otherwise, it is fairly easy to install!

New contacts added to HubSpot will automatically be graded/verified with this app. Trestle also has batch processing options from their portal.

Hope this helps!

Re: Real Phone Number Validation

AChau556 — Mon, 28 Jul 2025 10:58:18 GMT

Hey yhernandez,
You are right, just checking if a number has 10 digits isn’t enough. You want to make sure it's a real number, with a valid area code and correct format, especially for the US.
I’ve set up a smooth solution using Zapier, OpenAI, and Numverify, all without needing to write a single line of code. Here’s how it works:
Step 1: Format the Number with OpenAI
When someone submits a phone number in a HubSpot form, Zapier picks it up. Then I use OpenAI’s prompt step to clean it up and make sure it’s in the correct international format (e.g., removes spaces, symbols, and ensures the right prefix like +1 for the US or +353 for Ireland).
Here’s how that prompt looks inside Zapier:

Step 2: Validate with Numverify
Next, I send the cleaned number to Numverify using another step in Zapier. Numverify checks whether it’s a real, active number, validates the area code, and even returns carrier and location details.
Here’s what my setup looks like when sending the number to Numverify:

And this is what you get back – validation results and more:

Step 3: Use the Results
Once the number is verified, you can use Zapier to:
Update the contact in HubSpot with a formatted number
Add a custom tag like “Valid Number.”
Or even notify your sales team if the number is invalid

Why This Setup Works:
It’s fully automated – no manual checking
Works for US, Canada, and global numbers
No coding needed (no JS in your forms!)
Integrates directly with HubSpot via Zapier

Hope this helps you save time and avoid calling fake or invalid numbers
Let me know if you want help setting up the Zap!
— Aanchal

Re: Real Phone Number Validation

BérangèreL — Mon, 28 Jul 2025 11:05:39 GMT

Hi @AChau556 and welcome, we are so glad to have you on the HubSpot Community!

Thanks for sharing this workaround with us!

For information, we now have a native HubSpot validation for phone numbers, here is the article @yhernandez: "Set up phone number property validation".

I hope it helps!

Have a lovely day!

Best,
Bérangère

Re: Real Phone Number Validation

TTolley — Fri, 27 Feb 2026 07:15:09 GMT

Hi @yhernandez just last year Hubspot did release a new format and validate action built into workflows though it only tells you about whether the structure of the number is valid. I've built an app that might be useful so I was hoping I could throw it into the thread.
It's called Clean Dial and uses a third party api to lookup which phone numbers are live real-time and confirms the location. It works as an action in workflows. I wrote this blog piece about using HLR to keeping numbers in the CRM real. Hope this helps