"Legitimate" WhatsApp Number List (Your Own Contacts):

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A WhatsApp number list refers to a collection of phone numbers that are associated with active WhatsApp accounts.

However, it's crucial to understand the different contexts and implications of such a list:



In your personal WhatsApp app: You have a list of your phone contacts who also use WhatsApp. When you open WhatsApp, it automatically syncs with your phone's address book and shows you which of your contacts are on WhatsApp. You can also create "Broadcast Lists" within the app to send messages to a pre-defined group of up to 256 contacts at once, provided they have saved your number in their own address book.

For businesses using WhatsApp Business API: A business that has set up the official WhatsApp Business API (a solution for larger businesses to communicate with customers at scale) will maintain a database of customer phone numbers. These numbers are added to their system only after the customer has explicitly whatsapp number list opted in to receive messages from the business via WhatsApp. This is the only legitimate and compliant way for a business to maintain a "WhatsApp number list" for marketing and customer service.
"Illegitimate" or "Scraped" WhatsApp Number List:

This refers to a list of phone numbers that has been acquired through unauthorized means, such as scraping websites, buying databases, or other illicit methods, with the intent of sending unsolicited messages (spam) to individuals on WhatsApp.