Securing your app while maintaining a positive user experience can be challenging. Phone.Email's Free SMS OTP API simplifies the implementation of robust two-factor authentication. By utilizing the widespread availability of text messaging, you can verify user identities in a secure and familiar manner. This guide explains how to integrate Phone.Email's API into your app, enabling seamless signup and login with one-time passcodes via SMS. It covers best practices for SMS OTP implementation, customization options, integration with existing authentication flows, and tips for optimizing user experience. Enhance your app's security effortlessly with Phone.Email's efficient SMS OTP API.