You do not have to purchase a Twilio SMS number to set up WhatsApp as any phone number that can receive SMS can be used for your WhatsApp Business Account.
You must be able to receive SMS or a phone call using this number to complete the verification step.
If you have another phone number you wish to use, jump to Setting up your WhatsApp Business Account.
If you do not have a phone number that you want to use for your WhatsApp Business Account, and want to purchase a Twilio SMS Number follow the instructions below:
Purchasing a Twilio SMS Number
To purchase a Twilio SMS number you need to be an Admin with Billing Admin Access and follow these steps:
Go to the Billing Dashboard by clicking on the dollar icon in the Navigation Bar.
On the Dashboard, scroll down to Service Credit and make sure you have service credit on your account or purchase credit:
Then go to Admin > Channels > SMS > Numbers, and activate SMS by enabling the toggle.
Click on the "New" button and purchase a number.
Now you have a phone number, you can set up your WhatsApp Business Account.
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