Phone number validation

Validate customer phone numbers to ensure reachability and to distinguish mobile from landlines.
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Stylized illustration of a hand holding a mobile phone with a magnifying glass enlarging the phone number on the dial screen.

Real numbers only

By asking your customer to provide a phone number — and then validating the legitimacy of that number — you can minimize fraud while ensuring that you have a way to contact that customer in the future.

The right channel

Validating information enables you to distinguish mobile from landline numbers — ensuring that you don’t try to send text messages to landlines if reaching out via SMS.

Clean database

By periodically validating the numbers in your customer database, you can be sure that customer numbers are still reachable, reducing delivery errors when running SMS or voice-based marketing campaigns.

Optimize communication costs

Discover which carrier network a customer is using to optimize SMS routing when engaging your customer.

How phone number validation works

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1. Identify a phone number to validate

Your app can ask users to enter a phone number during registration or you can identify existing numbers in your customer database.
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2. Query Vonage APIs Number Insight

Your application passes the phone number to Number Insight API for analysis.
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3. Gather insight

Vonage APIs Number Insight queries multiple information sources to validate and gather information about the number.
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4. Act on validated information

Vonage APIs Number Insight returns information on the phone number to your application so you can remove unreachable numbers and identify valid numbers as mobile or landline.

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Why choose Vonage APIs for phone number validation?

Eliminate inaccuracies

Vonage APIs Number Insight is a comprehensive service that checks the validity, formatting, type, and reachability of each number.

Consolidate number information

Number Insight references multiple sources, including numbering plans, Vonage APIs databases, portability databases, and carrier databases – all in real time – to provide accurate, actionable intelligence.

Gain global insights

Number Insight can validate numbers from any location in the world, so you can be sure you have accurate information regardless of where users are using your app.

Integrate insights easily

Number Insight is a simple web API that you can integrate into your infrastructure within minutes. Number information is returned synchronously in the API response. Depending on the information desired, you can select between NI Basic, NI Standard, and NI Advanced.

Control costs and avoid waste

You can quickly and cost-effectively validate both new and existing phone numbers, ensuring that you can engage your customers via the right number and the right channel.

Related solutions

Mobile app promotion Invite website visitors to download your app by requesting a link to the app store via SMS.
Private SMS Communication Connect your users via text message privately.
Two-factor authentication Verify users by reaching their mobile device with SMS or voice codes.

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Start developing now with free credit. No credit card required.
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