This article guides readers on how to integrate Twilio's Verify API into a Ruby on Rails application to verify user phone numbers, with the goal of mitigating fraud and ensuring that users are real people. The process involves setting up an environment with Ruby 2.5.0, PostgreSQL, and the Authy gem, which abstracts Twilio's API. The article then walks through building a simple login action with phone verification, including implementing a `valid_phone_number?` method to determine if a submitted phone number is valid, and adding a form for users to enter a verification code sent via SMS. After verifying the user's phone number, the application updates the user's record in the database to indicate that they have been verified, providing a more secure authentication process.