Data is NOT Made Public: The phone numbers and names you sync are not made public to other Telegram users or third parties for marketing. This data is used internally by Telegram solely for the purpose of facilitating connections within the app.
Notifications for New Joins: If a contact from your synced list joins Telegram, you might receive a notification (e.g., "John Doe joined Telegram"). Telegram states they do this to notify you as soon as one of your contacts signs up for Telegram and to properly display names in notifications.
You Can Delete Synced Data: You have the power to stop syncing contacts at any time (Settings > Privacy and Security > Contacts > Sync Contacts: OFF). You can also explicitly "Delete Synced telegram number database Contacts" from Telegram's servers (Settings > Privacy and Security > Contacts > Data Settings). This action purges the contact data that was uploaded from your device.
Not a "Leak": The sync process itself is not a "leak." "Leaks" typically refer to unauthorized exposure of data, whereas contact sync is a user-initiated, permission-based process for service functionality.
No Automatic Phone Number Disclosure: While syncing helps you find others, it doesn't automatically disclose your phone number to everyone else. Your phone number visibility is controlled by separate privacy settings ("Who can see my phone number?").
In essence, Telegram's contact sync behavior is a well-defined process to enhance user experience by simplifying contact discovery, always operating with user consent and strong internal data handling protocols.
Regularly Review Your Privacy Settings: Take the time to review and adjust your privacy settings on Telegram to ensure they align with your preferences.
Conclusion
The answer is no - Telegram does not share your phone number with others on the platform. Your personal information is safe and secure when using this messaging app. By following best practices for online privacy and being mindful of the information you share, you can enjoy a safe and private messaging experience on Telegram.Whether Telegram shares your phone number is a nuanced question with answers depending on who is asking for the number and under what circumstances. Here's a clear breakdown: