Migrate an Existing WhatsApp Number to a Business Account
You can use a phone number that is already registered with the WhatsApp Messenger or the WhatsApp Business App. Remember to back up your chat history from the WhatsApp Business App. These are guides on how to do so for Android or iOS.
Once you migrate a phone number to the WhatsApp Business Platform, you cannot use that number on the WhatsApp Business App concurrently. Your number must be used either on the Business Platform or on the Business App.
To migrate a number, you must first delete the WhatsApp Messenger or WhatsApp Business App account.
- Open WhatsApp Messenger or WhatsApp Business app on your Android or iPhone
- Navigate to Settings > Account
- Select Delete my account. Messages sent to this phone number will be queued in the meantime
- Follow the steps to delete the WhatsApp account for that phone number. It may take up to 3 minutes for the disconnected number to become available
 Account Settings |  Delete My Account |  Deletion Steps |
Once the number is available, follow the instructions to Add a Phone Number.