Set options for unlocking the screen
The screen locks five seconds after it turns off automatically, or immediately if you turn the screen off manually. Use Secure Unlock if you want to require a PIN or a password to unlock the screen.
TIP If your company issued your device to you, check with your system administrator about whether the company has its own settings for locking and unlocking the screen of your device.
1Open Screen & Lock 
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2To turn Secure Unlock on: In Secure Unlock, tap Off. Tap Simple PIN or Password, and do one of the following:
Simple PIN: Enter a PIN of any length. This is a PIN that you make up. Enter the PIN again to confirm, and then tap Done.
Password: Enter a password containing any combination of letters and numbers, and then tap Done. Enter the password again to confirm, and then tap Done.
IMPORTANT Be sure to write down your PIN or password and keep it somewhere safe. If you forget your PIN or password, you need to remotely reset your device and may lose data.
3Tap Lock After to choose whether the screen locks after a designated time, or after the screen turns off.
4To turn Secure Unlock off: In Secure Unlock, tap the currently displayed option (Simple PIN or Password), and then tap Off. Enter the PIN or password, and then tap Done.
Change your Secure Unlock password
1Open Screen & Lock 
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2In Secure Unlock, tap Change PIN or Change Password.
3Enter the old PIN/password and the new PIN/password.
4Tap Done.
Get notifications when the screen is locked
1Open Screen & Lock 
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2In Show When Locked, tap On or Off to set whether notifications are displayed when the screen is locked.
Turn blink notifications on/off
If blink notifications are turned on, when the screen is off, the Center button blinks when a notification arrives and continues to blink until you tap the notification or turn on the screen. Blink notifications are on by default.
1Open Screen & Lock 
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2In Blink Notifications, tap On or Off.
Sounds & Ringtones
Set sound options
You can turn all sounds on or off. You can also turn a particular group of sounds, including keyboard clicks, notification alerts, and system sounds such as transition sounds, on or off. When sounds are on, you can set the sound volume.
Sounds are turned on by default.
Chapter 13 : Preferences 155