Tap on Privacy and Security.
Scroll down to the "Phone Number" section.
This setting controls whether your phone number is displayed on your Telegram profile.
Options:
Everybody: Anyone on Telegram who views your profile will see your phone number.
My Contacts: Only users who are in your telegram number database Telegram contacts (and are also in your phone's address book, if sync is on) will see your number.
Nobody (Recommended for privacy): Your phone number will never be visible on your profile to any other user.
How to Set: Tap this option and choose your preferred visibility.
2. "Who can find me by my number?"
This setting determines if someone can find your Telegram profile by searching for your phone number in the app's search bar.
Options:
Everybody: Anyone on Telegram who searches for your phone number can find your profile.
My Contacts: Only users who have your phone number saved in their device's address book (and use Telegram) can find your profile by searching for your number.
Nobody (Recommended for privacy): No one, not even your contacts, will be able to find your Telegram profile by searching for your phone number.
How to Set: Tap this option and choose your preferred discoverability.
3. Managing Contact Sync (Related Setting)
This isn't directly under "Phone Number," but it's crucial for privacy.