HTC 8X - Manual (Page 21)

Sleep mode
Sleep mode saves battery power by putting your phone into a low power state while
the display is off. It also stops accidental button presses when your phone is in your
bag or pocket. You’ll still receive messages and calls though.
Switching to Sleep mode
Briefly press the POWER button to turn off the display and switch to Sleep mode.
Your phone also automatically goes into Sleep mode when it’s idle for a while.
Waking up from Sleep mode
To wake your phone up manually, press the POWER button. You’ll need to unlock the
screen.
Your phone automatically wakes up when you have an incoming call.
Lock screen
Unlocking the screen
Swipe your finger up to unlock the screen or answer an incoming call.
If you've set up a password in the settings, you'll need to enter it to unlock the
screen.
21 Your first week with your new phone