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Before you can use a phone number for WhatsApp Business API, it must be disconnected from all existing WhatsApp accounts.
⚠️ IMPORTANT NOTE:
When disconnecting, ALL data on the original device will be permanently deleted:
  • All chat histories
  • Saved media
  • Contacts and groups
  • Backup data
Nothing changes for your contacts - they keep their chat history with your number.

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Preparations

1

Create backup

Secure important chats and media if needed
2

Inform contacts

Inform important contacts about the changeover
3

Prepare alternative

Set up an alternative WhatsApp number if necessary

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Disconnect Number - by App Type

1

Open Business Manager

Go to business.facebook.com
2

Navigation

Settings → Business Settings → WhatsApp Accounts → WhatsApp Manager
3

Phone Numbers

Click “Phone numbers” in the left sidebar
4

Delete number

Click the trash icon next to the number to be deleted
5

Confirm

Confirm the deletion in the dialog

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Option 2: In the app itself

1

Open app

Open WhatsApp Business on your phone
2

Settings

Menu → Settings → Account
3

Delete account

Select “Delete my account”
4

Enter number

Enter your phone number for confirmation
5

Confirm deletion

Tap “DELETE MY ACCOUNT”

Official Guide

Facebook Developer Documentation

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After Disconnection

What happens next?
  • The number is immediately available for WhatsApp Business API
  • Your contacts still see your name and previous chat
  • You can communicate with all contacts again via the API
  • New features like chatbot and multi-agent become available

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Common Problems

  • Wait 5-10 minutes after deletion
  • Make sure the number has been disconnected from ALL devices
  • Also check linked devices (WhatsApp Web, Desktop)
  • Make sure you have internet access
  • The entered number must match exactly
  • With 2-factor authentication: have PIN ready
Your contacts:
  • Keep their chat history with you
  • Can still message you
  • See no difference (except possibly business features)
Tip: Plan the disconnection outside your main business hours to minimize interruptions.