Number Verification API to be Replaced by Verify with Silent Authentication

Vonage is replacing its Number Verification API with the Verify API featuring Silent Authentication to simplify adoption and enhance security for developers and businesses. The transition, set to be completed by September 30, 2025, aims to provide a unified API that offers comprehensive silent authentication coverage, user-friendly flows, and improved fraud protection against threats like phishing and SMS traffic pumping. The Verify API includes fallback options to SMS, RCS, WhatsApp, email, or voice-based OTP if silent authentication is not feasible, ensuring secure and reliable operation under real-world conditions. Vonage emphasizes that the priority is not the technical standard used but rather providing an effective way to authenticate mobile users globally. A detailed migration guide is available to assist customers in transitioning smoothly to the new API.