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1. Can we use phone number that has been registered with Whatsapp Business before?

To apply for WhatsApp API Verification, you must use a phone number that is not currently associated with any WhatsApp accounts or applications.

However, before registering this phone number on the WhatsApp Business API, you will need to follow these steps to delete any existing WhatsApp account linked to that number.

Once a phone number is successfully registered on the WhatsApp Business API, it cannot be used for WhatsApp Business or the WhatsApp consumer app. It is possible to upgrade a phone number to the WhatsApp Business API, but downgrading it to use with WhatsApp Business or the consumer app is not possible.

To delete your account​

Step 1: Open WhatsApp.

Step 2: Tap More options > Settings > Account > Delete my account..

Step 3: Enter your phone number in full international format and tap DELETE MY ACCOUNT.

Step 4: Select a reason for why you're deleting your account in the dropdown.

Step 5: Tap DELETE MY ACCOUNT.

By Deleting your account will:

  • Delete your account from WhatsApp.

  • Erase your message history.

  • Delete you from all of your WhatsApp groups.

  • Delete your backup.

For more Go through the Information from Official WhatsApp documentations: Go to