How can I prevent my Lumia phone's camera from launching accidentally when the phone is in bag or pocket?

If you use the Camera (built-in app), you can take pictures quickly by pressing the camera key, even when your phone is locked. To disable this feature:

  1. On the Start screen, swipe left, and select Settings.
  2. From settings swipe left to Applications > Photos+camera (pictures+camera).
  3. Enable Prevent accidental camera launch when phone is locked