Passcode Lock. You can add a local passcode to your
mobile or desktop app, which is required to open the chat list and see your messages.
To add a passcode, go to
Settings > Privacy and Security > Passcode Lock. You can set the app to
automatically lock after a certain amount of time, and can
manually lock the app by tapping the
🔓 icon in your chat list.
If supported by your device, you can also enable
fingerprint or
face unlock, in addition to the numerical code. For extra security, you can also enable a
Two-Step Verification Password – which is required each time you
log in to your Telegram account.