Validate Phone Numbers Before Sending WhatsApp Messages with Vonage
Blog post from Vonage
Vonage’s tutorial explains how to reduce failed WhatsApp deliveries by validating phone numbers with the Identity Insights API before sending messages. It recommends requesting both the format insight, which confirms structural validity and normalizes numbers to E.164 format, and the current carrier insight, which identifies the carrier and network type; only numbers with a valid format and a MOBILE network type should receive WhatsApp messages. Developers can explore these checks in the Identity Insights Playground or call the API through cURL using JWT authentication. The tutorial also describes configuring the Messages API Sandbox, including allowlisting a WhatsApp number and sending a test message through its sandbox endpoint. Finally, it shows how the Vonage Tooling MCP Server can connect these steps to AI clients such as Claude or Gemini, enabling a natural-language prompt to validate a number and send a WhatsApp message only when the validation succeeds.
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