Samsung GALAXY S4 - How to lock and unlock your smartphone

Locking your smartphone screen prevents accidental or unauthorized use. While it is locked, you can still call 911.

To set up a security password or PIN for the first time

For enhanced security, you can set up your smartphone to require a password or PIN each time you want to use it. To set up your smartphone for password or PIN protection, do the following.

1. From the Home screen, tap Menu.
2. Select Settings.
3. Select Lock screen under the My device tab.
4. Select Screen lock.
5. Select one of the following high security options:
   
   1. PIN: Select this option if you wish to use a numeric code to lock and unlock your smartphone.
   2. Password: Select this option if you wish to use a typed word to lock and unlock your smartphone.
6. Type the desired PIN or Password.
7. Tap Continue.
8. Confirm your PIN or Password.
9. Tap OK.
10. Your smartphone is secured with a password or PIN.

To lock your smartphone screen

1. Press the Power button, located on the right edge of your smartphone.
2. Your smartphone screen is locked.

To unlock your smartphone screen

1. Press the Power button, located on the right edge of your smartphone.
2. Type the screen lock PIN or Password.
3. Tap OK.
4. Your smartphone screen is unlocked.