How to Confirm Phone Number Ownership with Lookup Identity Match in Python

Twilio’s tutorial explains how to build a Python Flask application that uses Lookup Identity Match to help confirm whether a user is associated with a submitted phone number, reducing fraudulent sign-ups while minimizing verification friction. The service compares supplied identity details, such as names, addresses, national IDs, or dates of birth, against authoritative data sources including carrier records, with US and Brazil numbers available without carrier approval and several other countries requiring registration. The walkthrough sets up a Flask project with Twilio and environment-based credentials, creates an international phone input form using intl-tel-input, validates numbers through the Lookup API, and then extends the form to collect first and last names. It updates the API request to include the Identity Match field and interprets results such as exact, partial, absent, or unavailable matches, treating exact and high partial first- and last-name matches as successful when the number is valid. The post also notes that developers can expand verification workflows with Lookup products such as line-type intelligence and SIM-swap detection, or use Twilio Verify for phone verification.

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