"My Contacts": Only people who have your phone number saved in their device's address book (and are on Telegram) will be able to find your profile by searching for your number.
"Everybody" (Avoid for Privacy): Anyone who has your phone number can find your Telegram profile by searching.
III. Managing Telegram's Contact Sync
This feature helps you find friends but involves sharing your contacts with Telegram.
Access Path: Settings > Privacy and Security > Contacts
To Disable Contact Sync:
Find the "Sync Contacts" toggle and set it to OFF (gray/left-aligned). This prevents Telegram from uploading new contacts from your device's address book in the future.
To Delete Already Synced Contacts from Telegram's Cloud:
After disabling "Sync Contacts," tap "Delete Synced Contacts" and confirm. This removes any contact data Telegram has previously uploaded from your address book from its servers.
Note: Your existing Telegram contacts (people you've chatted with or manually added) will remain. This only affects contacts synced from your phone's address book.
Toggle "Sync Contacts" ON. Ensure telegram number database Telegram has permission to access your phone's contacts in your device's system settings.
IV. Enhancing Login Security with Your Phone Number
Your phone number is the primary key to your account; secure it.
Two-Step Verification (2FA) (Mandatory!):
Enable It: Go to Settings > Privacy and Security > Two-Step Verification.