Privacy Restrictions: Telegram prioritizes user privacy. Accessing a user's phone number directly through their User ID without their explicit consent is generally not possible due to these privacy measures.
CallMeBot's Functionality: CallMeBot primarily focuses on providing APIs to send WhatsApp and Telegram messages and make Telegram phone calls (using text-to-speech).
No Direct API for Phone Number Retrieval: The CallMeBot documentation and related discussions do not indicate a free API endpoint that takes a Telegram User ID and returns the associated phone number.
Web Form (Limited Use): CallMeBot does new zealand telegram mobile phone number list have a web form on their site ("Get phone number from Telegram ID/User - Page 1000 - CallMeBot API") that might retrieve a phone number from a Telegram Username or ID. However, this is not an API for automated use and is subject to the user's phone number visibility settings within Telegram.
"The script used here follow the same principles and privacy policies than the official Telegram App so bear in mind that the Mobile Phone number has to be visible by Everybody or your contacts (including callmebot_api user) to get it using this web form."
"The usage of this form is for personal use only. If you need an API to get the the Phone Number from a Telegram Account, please contact me to get a solution implemented for you." This suggests that a direct API for this purpose is not freely available and might require a custom solution.
Ethical Considerations: Attempting to retrieve a phone number without the user's consent bypasses their privacy settings and is generally considered unethical.
In summary, you cannot use CallMeBot.com to freely get a Telegram user's phone number simply from their User ID, especially through an automated API. Any method to do so would likely depend on the user's privacy settings and might not be available for free or programmatic use.