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Steps to use phone number that has been registered with Whatsapp Business before

To apply for WhatsApp API Verification, you must use a number that does not have an account on any WhatsApp apps.

You can use a phone number that is already registered in the Android, iPhone, or Business application versions of WhatsApp.

However, to register this phone number on WhatsApp Business API, you will need to follow the steps below to delete the WhatsApp account associated with that phone number.

Once a phone number is registered on the WhatsApp Business API, it cannot be used for WhatsApp Business or the WhatsApp consumer app. A phone number can be upgraded to the WhatsApp Business API, but not downgraded.

To delete your account

  1. Open WhatsApp.
  2. Tap More options > Settings > Account > Delete my account.
  3. Enter your phone number in full international format and tap DELETE MY ACCOUNT.
  4. Select a reason for why you're deleting your account in the dropdown.

Deleting your account will:

  • Delete your account from WhatsApp.
  • Erase your message history.
  • Delete you from all of your WhatsApp groups.
  • Delete your backup.
  • Disable the QR code of your old WhatsApp account.

Information from Official WhatsApp documentations: 

Backup your chats

  1. You can backup your WhatsApp Chats into JSON files
  2. To back up, you can use our Google Chrome Add-on from here:
  1. The chat files once backed up can be later imported to WATI (texts only)
  2. Guide to using the WhatsApp Chat Backup Add-on

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