How to Set Up Screen Lock on Android: PIN and Biometrics

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Why your screen lock matters

Without a strong screen lock, anyone who picks up your phone can access your emails, banking apps, and saved passwords instantly. A six-digit PIN is significantly harder to guess than a four-digit one, and a password is stronger still.

A pattern lock is less secure than a PIN: patterns leave smudge trails on the screen
Four-digit PINs have only 10,000 combinations; six-digit PINs have 1,000,000
A password with letters and numbers is the strongest option but least convenient

3 steps

Setting your PIN or password

To change or set your screen lock:

Open Settings and search for "Screen lock" or go to Settings > Security > Screen lock
Choose PIN (recommended minimum: six digits) or Password
Avoid obvious choices: your birthday, 123456, 000000, or phone number
Confirm your choice and tap Save or OK

4 steps

Adding fingerprint or face unlock

Biometrics make it faster to unlock your phone without weakening security. Your PIN remains as a backup. To set up fingerprint recognition:

Go to Settings > Security > Fingerprint (name varies by manufacturer)
Enter your PIN when prompted, then follow the on-screen instructions
Scan the same finger from multiple angles for better recognition accuracy
Add a second finger as a backup, for example your other index finger
For face unlock: Settings > Security > Face Recognition, note that face unlock is less secure than fingerprint

5 steps

Screen timeout settings

Your screen lock is only effective if it activates quickly when you put your phone down. Adjust your timeout:

Go to Settings > Display > Screen timeout (or Screen sleep)
Set it to 30 seconds or 1 minute: enough for normal use without leaving your phone exposed
Avoid "Never" timeout; this means your phone never auto-locks
Use the power button to lock your phone immediately when you put it down

4 steps

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Screen lock, PIN, and biometrics on Android

Why your screen lock matters

Setting your PIN or password

Adding fingerprint or face unlock

Screen timeout settings