Accurate information, anywhere.

Make the most of existing customer information. Our API lets you identify billions of phone numbers around the world and determine the best way to reach your customers using fresher data from real-time sources. Assess risk, prevent fraud, block fake accounts and increase acquisition—all without relying on customer input.

See how our Number Insight API helps businesses like yours succeed.

Ensure your customers are reachable.

Validate the legitimacy of customer phone numbers to confirm reachability and reduce delivery errors.

See Phone Number Validation

Protect your business from fraud.

Prevent costly fraudulent transactions using up-to-date phone number intelligence.

See Fraud Detection and Step-Up Verification

Offer an enhanced customer experience.

Identify callers and anticipate customer intent with Caller Identification.

Verify customers in context.

Easily authenticate customers based on their intent—from signup to sign in—with Tiered User Verification.

Discover more ways our Number Insight API can help you make better business decisions.

See All Use Cases

A variety of packages to choose from.

From identifying number type to anticipating user intent and determining risk, our Number Insight packages give you access to the details you need most.

See Pricing Details

See how others are making the most of Number Insight with Nexmo.

Using Nexmo’s Number Insight API, Mobyquest achieved a 95% accurate match for number type and carrier, significantly minimized overall communications costs, provided a highly efficient, low latency service to its customers, and decreased development resources.

Read the full story

Using Nexmo’s Number Insight API, Mobyquest achieved a 95% accurate match for number type and carrier, significantly minimized overall communications costs, provided a highly efficient, low latency service to its customers, and decreased development resources.

Read the full story

Using Nexmo’s Number Insight API, Mobyquest achieved a 95% accurate match for number type and carrier, significantly minimized overall communications costs, provided a highly efficient, low latency service to its customers, and decreased development resources.

Read the full story