1. On the Settings screen, touch Location & security > Set up screen lock > Pattern.
2. Flick your finger vertically, horizontally or diagonally, connect at least four dots in any order you choose. Lift your finger from the screen when you are finished. You must drag your finger between the dots on the screen to create the pattern, not simply touch individual dots.
3. Your mobile phone will record the pattern. Touch Continue.
4. When prompted, draw the screen unlock pattern again, and then touch Confirm. To change your unlock screen pattern, touch Location & security > Change screen lock.