Samsung Galaxy S III - Using a Visible Pattern; Locking Automatically; Lock Instantly with Power Key; Vibrate on Screen Tap

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Using Swipe
This feature is the least secure locking method and only requires
that a user swipe the screen to unlock the device.
1. From the main
Settings page, tap Lock screen .
2. Tap
Screen lock ➔ Swipe .
Using a Motion to Unlock
This feature allows you to lock or unlock your device by simply tilting
it and moving it either forwards or backwards.
1. From the main
Settings page, tap Lock screen .
2. Tap
Screen lock ➔ Motion ➔ OK .
To unlock a device with motion:
1. Verify the device is on and on the Lock screen.
2. In a single motion, use your thumb to touch and hold the Lock
screen, then quickly tilt the device towards you.
Note: If you forget, these instructions appear at the bottom of the Lock
screen.