Fingerprint Sensor

Android 6 allows third party developers to connect to the fingerprint sensor via API. Telegram supports unlocking the passcode with the fingerprint. You have to set up a fingerprint in the Android settings.

  1. Launch the Settings app and tap on “Lock screen and security” under the Personal tab.
  2. Tap on Fingerprints, located in the middle of the screen just under the Security heading.
  3. First-time users will immediately be prompted to scan a fingerprint.

Those who already have at least one fingerprint registered will need to tap on “Add fingerprint” and follow the prompts.

CNET has an excellent how-to with screenshots for the S6 here.