Go to Settings > Privacy and Security > Contacts.
Toggle "Sync Contacts" OFF. This prevents Telegram from uploading your device's address book to its servers.
Tap "Delete Synced Contacts". This removes any contact information that Telegram might have previously uploaded from your device. This is crucial for severing links to your real-world contacts.
Review Your Profile Information:
Display Name: Use a pseudonym or a generic name. Avoid telegram number database your real full name.
Profile Photo: Do not use a photo that can identify you (e.g., your face, unique tattoos, distinctive backgrounds). Use a generic image, avatar, or leave it blank.
"About" / Bio: Keep this blank or generic. Avoid any personal details (location, profession, links to personal social media).
Control "Last Seen & Online" Status:
Go to Settings > Privacy and Security > Last Seen & Online.
Set to "Nobody". This prevents others from knowing when you were last active or if you are currently online, adding another layer of privacy.
Manage "People Nearby" Feature:
Go to Contacts > People Nearby (or Settings > People Nearby).
Ensure "Stop Showing Me" is selected. This feature reveals your approximate location to other users nearby, which directly compromises anonymity.
Go to Settings > Privacy and Security > Forwarded Messages.