Turning the screen on using the Knock Code feature
If your Lock screen unlock sequence is set to a Knock Code, tap your Knock Code on the darkened screen to automatically turn on the backlight and unlock the screen at the same time.
TIP | When the screen is in timeout and a Knock Code is set, pressing the Power/Lock button  displays the Lock screen (e.g., to check the time). You can tap your Knock Code to unlock the screen or press the Power/Lock button  again (or double-tap the Status Bar) to turn the backlight back off. |
NOTES | - Enter the incorrect Knock Code 5 times and a caution is displayed. Enter it incorrectly again and you'll be prompted to enter your backup PIN to unlock your phone.
- Use a fingertip instead of a fingernail to tap your Knock Code on the screen.
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