Phone number rules for WhatsApp Business API
Which numbers work, porting rules, and common pitfalls.
The phone number you use for the API must be able to receive either an SMS or a voice call for verification. It cannot be currently registered on WhatsApp Messenger or WhatsApp Business App.
Supported number types
Mobile numbers and landlines (with voice call verification) both work. Toll-free numbers are supported in some countries. Virtual numbers from VoIP providers may work if they can receive SMS or calls.
Porting an existing number
If your number is currently on the WhatsApp Business App, you must delete the app from that number first, then wait a few minutes before registering it through the API. SendBlix's migration wizard guides you through this.