Your users are in San Francisco, Jakarta, São Paulo, and Sydney. They have WhatsApp open all day. They check it before they check their SMS inbox. When your app sends an OTP to their phone number, it lands in a carrier SMS thread they barely look at. When it lands in WhatsApp, they see it instantly. In this article, you will learn: Why WhatsApp OTP delivers better completion rates than SMS in high-penetration markets How Kinde delivers phone OTPs via WhatsApp when configured, with automatic SMS fallback What you need before you start: Twilio account, WhatsApp Sender, Kinde Pro How to configure Twilio Verify with a WhatsApp Sender How to connect your Twilio account to Kinde How to enable phone authentication in your Next.js app How to enable WhatsApp as the delivery channel in Kinde How to configure SMS as the automatic fallback How to test the full flow before going live What to watch for in Africa, South Asia, and Southeast Asia specifically Let's dive in!…