---
title: "How to Confirm Phone Number Ownership with Lookup Identity Match"
description: "The tutorial shows how to use Twilio Lookup Identity Match to confirm that a person is linked to a submitted phone number and reduce sign-up fraud. It describes a zero-knowledge match against authoritative sources such as mobile carrier records, with possible use during sign-up, login, account changes, or checkout. The implementation starts from an international telephone input project, collects first and last names alongside an E.164 phone number, and passes them to the Lookup API with the identity_match field; the response exposes per-field statuses and a summary score. The sample JavaScript treats the check as successful when the phone is valid and both names are exact or high partial matches, then displays the result, while the post also notes approval requirements outside the US, test parameters, and alternative Lookup packages."
---

# How to Confirm Phone Number Ownership with Lookup Identity Match

[Twilio](https://yomu.fyi/company/twilio) · Kelley Robinson · Aug 31, 2026

**Type:** Tutorial

## Summary

The tutorial shows how to use Twilio Lookup Identity Match to confirm that a person is linked to a submitted phone number and reduce sign-up fraud. It describes a zero-knowledge match against authoritative sources such as mobile carrier records, with possible use during sign-up, login, account changes, or checkout. The implementation starts from an international telephone input project, collects first and last names alongside an E.164 phone number, and passes them to the Lookup API with the identity\_match field; the response exposes per-field statuses and a summary score. The sample JavaScript treats the check as successful when the phone is valid and both names are exact or high partial matches, then displays the result, while the post also notes approval requirements outside the US, test parameters, and alternative Lookup packages.

## Context

The post addresses fake accounts and sign-up fraud by using phone-number ownership and identity matching to increase trust in legitimate, unique users. It positions Identity Match as a lower-friction alternative to credit bureau and document verification for AML-related checks.

## Approach / What changed

The example extends an international telephone input project with first-name and last-name fields, sends those values with the phone number to Twilio Lookup using the identity\_match field, evaluates the returned match statuses, and displays a success or error message in the form.

## Takeaways

- Identity Match accepts any combination of name, address, national ID, or date of birth for matching; fields that are not supplied return null in the response.
- Responses can contain exact\_match, no\_match, no\_data\_available, and partial-match results, alongside per-field error information and a summary\_score.
- The example accepts a registration when the phone number is valid and both first- and last-name results are exact\_match or high\_partial\_match, allowing variations such as Kelly and Kelley.

**Tags:** [API](https://yomu.fyi/topic/api), [JavaScript](https://yomu.fyi/topic/javascript), [Twilio](https://yomu.fyi/topic/twilio)

- Source: [Twilio](https://www.twilio.com/en-us/blog/confirm-phone-number-ownership-lookup-identity-match)
- Source URL: https://www.twilio.com/en-us/blog/confirm-phone-number-ownership-lookup-identity-match
- Ingested by Yomu: 2026-09-09T13:36:04.200Z

[Read original post](https://www.twilio.com/en-us/blog/confirm-phone-number-ownership-lookup-identity-match)