Passwordless authentication is a method of verifying user identity without using passwords, utilizing alternatives like biometric authentication, authenticator apps, and knowledge-based techniques to enhance security and user convenience. This approach addresses the vulnerabilities and inconvenience associated with traditional passwords, as evidenced by the high prevalence of phishing attacks and data breaches. The text highlights a significant trend towards passwordless methods, with predictions that by 2022, a substantial majority of enterprises would adopt these methods in many use cases. The article provides a detailed guide on implementing passwordless authentication in React Native applications using Auth0, a popular authentication platform, and Twilio for SMS functionality. It walks through setting up a React Native project, configuring iOS app settings, creating an Auth0 account, and enabling SMS connections to authenticate users via phone numbers. The guide emphasizes the ease and security benefits of passwordless systems, encouraging developers to adopt these modern authentication practices to enhance user experience and security.