WhatsApp Business App (for small businesses):

[Mitu100@]

1. For Individual Users (Your Personal WhatsApp)
How it Works: Your personal WhatsApp account automatically creates a "list" of WhatsApp users by syncing with your phone's address book. If a number saved in your phone contacts is also registered on WhatsApp, that contact will appear in your WhatsApp chat list.
Creating "Lists" (for personal organization): WhatsApp has a "Lists" feature (often called "Chat Filters" or "Custom Lists") that allows you to organize your existing chats. You can create custom categories (e.g., "Family," "Work," "Friends") and assign individual chats or groups to these lists. This helps you quickly find relevant conversations within your own app.
How to create a custom list:
Open WhatsApp and go to whatsapp number list the "Chats" tab.
Swipe down from the top to reveal the "Lists" bar.
Tap the "+" icon (or "New List").
Give your list a name.
Add existing chats or contacts to that list.
Limitations: This feature is purely for your personal organization within the app. You cannot use these lists to send bulk messages to people who haven't explicitly opted in to receive messages from you via a business account.
2. For Businesses (WhatsApp Business App & API)
This is where "WhatsApp number lists" become relevant for marketing, but with strict rules and ethical considerations. Businesses cannot simply buy or scrape phone number lists and start messaging.