Types of Usernames:
Basic Usernames: These are free, first-come, first-served, and unique to each user.
Collectible Usernames: Introduced via the Fragment platform, these are shorter, more distinctive usernames that can be bought and sold using Toncoin. A user can have multiple collectible usernames assigned to their profile, groups, or channels.
Privacy Control: Your personal phone number privacy settings (e.g., "Who can see my phone number?" set to "Nobody") directly dictate whether your phone number is visible on your profile to someone who found you via your username.
2. Telegram User ID (Numeric ID)
Internal Identifier: Every Telegram user, group, and channel has a unique numeric User ID (also sometimes referred to as Chat ID). This is a long string of numbers (e.g., 123456789).
Backend Use: The User ID is primarily a backend identifier used by Telegram's servers and for API interactions (e.g., by bots, developers). It's not typically visible to the average user in the app's interface.
Finding Your User ID: You can usually find your own User ID by interacting with specific bots (like @RawDataBot) that are designed to display this information.
Privacy Implications: The User ID itself doesn't inherently telegram number database expose your phone number or personal details. It's an internal reference. However, if someone has your User ID, and your privacy settings for your phone number or other profile details are lax, they might be able to combine this information with other data from public sources (OSINT) to identify you.