Can I use a number that I already own as the number for the Sinch WhatsApp Business API?

Yes! Note that you must be able to collect a pin code verification delivered to the number by SMS or Voice and provide it to Sinch within 10 minutes of receipt.

Note: It has a very short Expiry - Time to Live (TTL).

When using a phone number that you already own, you must make sure that the device associated with this phone number is not sitting behind an Interactive Voice Response (IVR) system, otherwise the number cannot be supported.

Learn more about the Sinch WhatsApp Business API.