How to Create a Phone Number-Based Authentication Flow (Part 2)

In the second part of a series on creating a phone number-based authentication flow, the focus shifts to developing a mobile application that uses the Vonage Number Verification API to enhance security by replacing traditional SMS verification with a more robust two-factor authentication (2FA) method. This tutorial guides users through setting up a user interface in an Android application using Kotlin, detailing the implementation of backend communication for login and authorization processes. The application sends user phone numbers to a backend server and uses the Vonage Client SDK to verify these numbers through network APIs, bypassing WiFi to use mobile data for additional security. Overall, this approach aims to provide a secure and user-friendly alternative to SMS-based verification, reducing fraud risks associated with SMS channels. The full source code is available on GitHub, and users are encouraged to join the Vonage Developer Community for further support and updates.