Phone Number Verification API

Easily validate users with our phone number verification API from Nexmo™

Create seamless product installations and login experiences for your customers while protecting your information (and reputation).

Two-factor authentication that boosts security, pain-free.

Verify phone numbers quickly with two-factor authentication. The API detects and automatically blocks numbers that are used for spam and fraud—so you’ll get peace of mind. (And your true customers get on with their day.)

Global reach with a local touch.

We partner with networks across the globe to address compliance. Plus, local our language and accent options can help increase your verification success.

Control costs.

With our phone number verification API, you only pay for successful verifications. No ifs, ands, or buts.

In good company.

Businesses around the world rely on our communication APIs, like:

Features you (and your customers) will love.

Adaptive Routing

Determine the fastest routes in real time.

Mobile and landline verification

Automatically select SMS or voice verification.

Global compliance considerations

Remove the complexity of global carriers and regulations.

Customization

Customize templates, pre-record voice calls, and configure time between retries.

Block spam and fraud

Detect and block numbers that are used for spam and fraud.

"Nexmo's developer relations team have been super helpful overcoming any issues I've encountered...All issues overcome have later been reflected in their documentation to help other developers."

Marcus Noble, Developer

Build it your way, and keep your developers happy.

Your developers will get our ready-to-use, high-quality verification API, plus super-speedy support and a rockstar community network.

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