This is generally not possible for a Whatsapp bot to freely get the phone number of a user without the user explicitly sharing it. Here's why, based on the search results:
Privacy by Design: Whatsapp prioritizes user privacy. By default, a user's phone number is hidden from other users and bots. Users have granular control over who can see their phone number denmark whatsapp number data in their privacy settings ("Everybody," "My Contacts," "Nobody").
Bot API Limitations: The Whatsapp Bot API does not provide a direct method for a bot to retrieve a user's phone number simply by knowing their Whatsapp ID.
Explicit User Sharing Required: The only legitimate way for a bot to obtain a user's phone number is if the user explicitly shares it with the bot. This can be done through:
Request Contact Button: Bots can use a KeyboardButton with the request_contact=True parameter. When the user taps this button, they will be prompted to share their phone number with the bot. The user has to explicitly grant this permission.
Manual Input: Users can manually type and send their phone number to the bot.
No Automatic Retrieval: Bots cannot automatically access a user's phone number just because they are in the same group or interact with the bot.
Third-Party Tools: Be extremely cautious of any third-party bots or tools claiming to extract phone numbers from Whatsapp users without their consent. These are likely to be scams or violate Whatsapp 's terms of service and user privacy.
The, a Whatsapp bot cannot freely get a user's phone number. User interaction and explicit sharing are required for a bot to access this information.