Face Unlock on Samsung Galaxy phones

• Open Settings.
• Tap Biometrics and security.
• Tap Face recognition, and then tap Continue.
• If you don’t already have a screen lock set up, you’ll be asked to set it up. This screen lock acts as a fall back option. Once the screen lock is set up, you’ll be asked whether you’re wearing glasses. Answer it.
• Now your phone will scan your face. Once you’re done, adjust the settings, and then tap Ok.

Samsung provides a number of face recognition options like faster recognition, require open eyes, brighten screen, and support for Samsung Pass. You can enable or disable these as per your needs.

Xiaomi phones

• Open Settings.
• Tap on Password & security.
• Tap on Face unlock. If you haven’t already set up a screen lock, set it up before setting up the Face unlock.
• Enter your lock screen password.
• Tap Next, and follow on-screen instructions.

OnePlus phones

• Open Settings.
• Tap on Security and lock screen.
• Tap on Face Unlock.
• Now tap on Add Face Data. You’ll be asked to enter your existing PIN or password, or asked to create one.
• Follow the on-screen instructions to complete the process.

Pixel phones

• Open Settings.
• Tap Security, then go to Face Unlock.
• If you’ve set up a PIN, pattern, or password, you’ll be asked to enter it. If you don’t already have a screen lock,  you’ll be asked to set that up.
• Then tap on Set up face unlock.
• Agree to the disclaimer, and start. The phone will scan your face. Follow the on-screen instructions.
• Tap Done.

Face Unlock is now set up for your Pixel phone. You can turn on Face Unlock support for app sign-ins and payments by going to Settings > Security > Face unlock.

Oppo phones

• Go to Settings.
• Tap Fingerprint, Face & Passcode.
• If you don’t already have a passcode set up, you can now set up a passcode before activating Face Unlock for your phone.
• Once you’re done with the passcode, tap on Enroll face.
• Follow the on-screen instructions and complete the process.

Apart from unlocking your phone, you can also use Face Unlock for App Encryption and File Safe on your Oppo phone.

Vivo phones

• Open Settings.
• Go to Fingerprint, face and password.
• You’ll now be asked to enter your PIN or password. If you haven’t set up a screen lock, set it up first.
• Go back to Fingerprint, face and password, and tap Face.
• Tap on Add a face.
• Enter your lock screen password.
• Tap Ok on the disclaimer.
• Follow the on-screen instructions.

If you’re using a smartphone from any other Android manufacturer, you’ll typically find the Face Unlock setup under Settings > Security (or something like that).