Windows Phone - Take pictures from the lockscreen

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To allow the use of the camera app without unlocking the screen of your Windows Phone device, you will need to enable a small option:
  • Swipe from left to the right side of the StartScreen and go to Settings.
  • Swipe from the left to access the Applications menu.
  • Go to photos+camera
  • Check "Press and hold camera button to wake up the phone".