Samsung Galaxy S4 GT-I9515 - Setting a Pin; Setting a Password; Unlocking the Device

Basics
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Setting a PIN
On the Applications screen, tap Settings
→
My device
→
Lock screen
→
Screen lock
→
PIN .
Enter at least four numbers, and then enter the password again to verify it.
Setting a password
On the Applications screen, tap Settings
→
My device
→
Lock screen
→
Screen lock
→
Password .
Enter at least four characters including numbers and symbols, and then enter the password
again to verify it.
Unlocking the device
Turn on the screen by pressing the Power button or the Home button, and enter the unlock
code.
If the unlock code is forgotten, take the device to a Samsung Service Centre to reset it.