Fix: WhatsApp 'Unsupported phone numbers such as VoIP' for AI Agents

If you're building AI agents that need WhatsApp Business API access, you've seen this: Unsupported phone numbers, such as VoIP, landlines, and premium rate numbers WhatsApp has the strictest phone verification in the industry. Here's why, and how to solve it. WhatsApp's Verification Requirements WhatsApp's official FAQ is explicit: "Unsupported phone numbers, such as VoIP, landlines, and premium rate numbers, are not eligible for registration." Unlike Stripe or Google which silently reject, WhatsApp tells you exactly why. Their system performs: Carrier database lookup — Checks LERG/NPAC for line type HLR query — Verifies active mobile network registration Historical abuse check — Numbers previously used for spam are permanently blocked Country-carrier validation — Number must be from a carrier operating in the declared country Why WhatsApp Is Stricter WhatsApp is the primary communication platform in 180+ countries. They block VoIP because: Spam prevention: VoIP numbers are 40x more li