🔐 Set Strong PIN & Lock Screen

Why This Matters

A weak or nonexistent lock screen is an open invitation for physical access attacks. If someone gets their hands on your unlocked phone—even for 30 seconds—they can install spyware, read your messages, access your accounts, and steal your data.

What you'll accomplish:

• Strong 6-digit PIN: Much more secure than 4-digit PINs or patterns
• Biometric backup: Fingerprint or face unlock for convenience
• Auto-lock timer: Lock your phone after 30 seconds of inactivity
• Lock screen security: Hide sensitive notifications

Step-by-Step Instructions

1

Open Security Settings

Go to Settings → Security (or "Security & privacy" depending on your device).

✓ You should see: Security option in Settings menu

2

Tap Screen Lock

Under "Device security," tap Screen lock. If you see a warning that no screen lock is set, that's what we're fixing.

✓ You should see: Screen lock option with current setting (None, Swipe, Pattern, PIN, or Password)

3

Choose PIN

Select PIN from the list of lock types. Avoid "Pattern" (smudge marks) and "Swipe" (no security).

🔐 Lock Type Security Comparison

• None/Swipe: ❌ No security
• Pattern: ⚠️ Smudge marks reveal pattern
• 4-digit PIN: ⚠️ Only 10,000 combinations
• 6-digit PIN: ✅ 1 million combinations (RECOMMENDED)
• Password: ✅ Most secure, but inconvenient

4

Create a Strong 6-Digit PIN

Enter a 6-digit PIN. Do NOT use:

• Birthdays (1985, 0312)
• Repeating digits (111111, 123456)
• Sequential numbers (123456, 654321)
• Common PINs (000000, 123123)

How to create a strong PIN:

1. Think of a memorable phrase: "I love tacos on Friday"
2. Take first letters: ILTOF
3. Convert to numbers (phone keypad): 45863
4. Add a random digit: 458637

5

Confirm Your PIN

Re-enter your PIN to confirm. Make sure you remember it—write it down and store it securely if needed.

✓ You should see: Confirmation screen asking you to re-enter PIN

6

Configure Lock Screen Notifications

Choose how notifications appear on your lock screen:

• "Hide sensitive content" (RECOMMENDED): Shows "New message" but not the content
• "Don't show notifications": Maximum privacy, but less convenient
• "Show all content": ❌ Anyone can read your messages without unlocking

7

Enable Biometric Unlock (Optional)

Go back to Security settings and enable Fingerprint unlock or Face unlock for convenience. Your PIN is still required as a backup.

👆 Biometric Security Notes

• Fingerprint: More secure than face unlock
• Face unlock: Can be fooled by photos on some devices
• Both: Require your PIN after restart for security

8

Set Auto-Lock Timer

Go to Settings → Display → Screen timeout. Set it to 30 seconds or 1 minute.

✅ Lock Screen Secured!

Your device now has:

• ✓ Strong 6-digit PIN
• ✓ Hidden sensitive notifications
• ✓ Biometric unlock (if enabled)
• ✓ Auto-lock after 30 seconds

Additional Security Settings

🔒 Enable "Power button instantly locks"

Settings → Security → Power button instantly locks → Turn ON

Why: Pressing the power button immediately locks your phone, even if auto-lock timer hasn't expired.

🚫 Disable Smart Lock

Settings → Security → Smart Lock → Disable all options

Why: Smart Lock keeps your phone unlocked in "trusted" locations or near "trusted" devices—but these can be spoofed by attackers.

📵 Disable Lock Screen Widgets

Settings → Security → Lock screen preferences → Disable widgets

Why: Some widgets can leak information or provide access without unlocking.

Troubleshooting

❓ I forgot my PIN

If you forget your PIN, you'll need to factory reset your device (which erases all data). This is why it's important to:

• Write down your PIN and store it securely
• Set up biometric unlock as a backup
• Regularly back up your data

❓ Biometric unlock isn't working

• Clean your fingerprint sensor or camera
• Re-register your fingerprint/face
• Make sure your hands are dry (for fingerprint)
• Use your PIN if biometrics fail

❓ My phone locks too quickly

Balance security with convenience. 30 seconds is recommended, but you can extend to 1-2 minutes if needed. Never set it longer than 5 minutes.

Next Steps

1. Use Faraday bags: Block all signals when you need complete privacy → Guide #8: Faraday Bags (Coming Soon)
2. Check for spyware: Detect surveillance apps → Guide #9: Check for Spyware (Coming Soon)
3. Harden Google Account: Add Yubikey passkey → Guide #12: Google Account Security (Coming Soon)