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Operation Cell Phones Last Updated 12/11/2018

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

Note: KnockON double-tap to wake the screen is disabled when Knock Code lock screen is enabled. See the Lock screen article for additional information on lock screen features.

  1. From the Home screen, tap Apps  icon > Settings  icon > Display tab  icon > Lock screen  icon

  2. Tap Select screen lock > Knock code.

  3. Read the tutorial and tap the Next button.

  4. Tap 2-8 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.

Screen off

When the screen is off, 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.

 gif showing the 4 taps on the screen while the screen is off

Lock screen

When your device is on, and you are on the locked screen, tap your Knock Code in the area enclosed by angle brackets under the clock widget to unlock your phone.

 gif showing the 4 taps on the screen while on the lock screen

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

  1. After five incorrect Knock Code attempts, a notification appears saying “Wrong Knock code entered 5 times in a row...” and a Forgot Knock code? button appears at the bottom right side of the screen. Read the notification, and tap OK.

     wrong knock code

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

     2 by 2 knok screen

  3. If you incorrectly enter your Knock code for the 6th time, you cannot enter it anymore. You should unlock your phone by logging into your Google account or by entering the backup PIN (if created) and tap OK.

If you do not have a Google account added to your device, you will need to perform a factory reset.

Caution: A factory reset will delete all user applications and user data not backed up. To learn how to backup your user data, click here.

To perform a factory reset:

  1. Turn the phone off.
  2. Press and hold the Volume Down key + Power/Lock key on the back of the phone.
  3. Release the Power/Lock key only when the LG logo is displayed. Then immediately press and hold the Power/Lock key again.
  4. Release all keys when the Factory data reset screen is displayed.
  5. Press the Volume key up or down, highlight Yes and press the Power/Lock key to continue. To cancel select No (Exit) and press Power/Lock key.
  6. Press the Volume key up or down, highlight Yes and press the Power/Lock key to confirm. Once confirmed the device will restart and factory data reset will be performed.

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