Skip to Contents Skip to Accessibility Help

Help Library

Find help information for your LG product


LG G VISTA VS880 Knock ON™ & Knock Code™

Operation Cell Phones Last Updated 04/19/2018

LG G VISTA VS880 Knock ON™ & Knock Code™

With Knock ON you can set the phone to turn the screen on by quickly double-tapping the screen. Double-tap an empty area in the Home screen, Status Bar, or Lock screen to turn the screen off.

Knock Code is a security feature that enables a user to unlock the phone when the screen is off. The Home screen can be accessed directly if you tap the sequence anywhere on the screen.

Knock ON and Knock Code can be used simultaneously.

Note: Knock ON feature cannot be disabled..

See the Lock screen article for additional information on setting up your lock screen.

Knock On
Set Knock Code
Use Knock Code
Forgotten Knock Code?

Knock On

A quick double-tapping on the center of the screen turns the screen on without pressing the Power/lock key. The phone senses the gesture and turns the display on or off.

Note: The Knock ON double-tap wakes the display. If the screen lock is set to None, Knock ON will wake to the Home screen; otherwise you will see the lock screen (Knock Code shown above).


  1. To reduce battery consumption and prevent unintended knocks, your phone is designed to sense the knocking gesture anywhere on the screen, but preferably in the area on the center of the screen.

  2. If the phone is moved when you knock on the screen, the knocking gesture might not be sensed. e.g. Knocking the screen with your thumb while holding the phone in your hand.

  3. You should double-tap with a fingertip, not with a nail, to wake the display or put it to sleep.

  4. Knock On feature cannot be disabled.

  5. You can use your Google Account (if setup on phone) and backup PIN in case you forget your knock code sequence.

. Back to Top
Set Knock Code
  1. From the Home screen, tap Apps > Settings > Lock screen

  2. Tap Select screen lock > Knock Code.

  3. Read the tutorial and tap the Next button.

  4. Tap 3-8 times in the 2X2 grid shown to set your knock code. Then tap the Continue button. 

  5. Re-tap your code and tap the Confirm button.  

Note: Follow the on-screen instructions to create a backup PIN number in case you forget your knock code.

Use Knock Code

Screen off

When the screen is off, holding the phone in portrait orientation, tap the sequence of your Knock Code anywhere on the screen to access the Home screen directly. You can enter your code in a small space, or over the full width of the phone..

Lock screen

Use Knock ON double-tap or press the Power/lock key to wake the screen. Tap your Knock Code sequence in the area enclosed by angle brackets (as shown below) to unlock your phone .

Note: Images simulated. Actual device does not show highlighted circles when the screen is pressed.

Back to Top
Forgotten Knock Code?
  1. After five incorrect Knock Code attempts, a Security check notification appears Read the notification, type the sentence, and tap OK.

    You should unlock your phone by logging into your Google Account (if setup on phone) or by entering the backup PIN you created during setup. Then tap OK to unlock.

  2. The next screen shows a 2x2 grid that provides the same environment as a Knock Code setup for a more accurate input.

  3. Tap Forgot knock code and enter Google account or PIN OR continually enter the codeAfter nine incorrect attempts, a Final attempt warning will display, and after ten incorrect attempts, the phone will delete all user data and reset the device to factory setting.

Back to Top

Article Feedback

Q1. Overall, how satisfied were you with the usefulness of this information?
1 2 3 4 5
Q1-1. Why were you dissatisfied with the usefulness of this information?
Q2. How would you improve the information?

Characters left : 500 / 500