HTC One User Manual page 63

Wake up the phone directly to Camera
1. Lift the phone in landscape orientation.
2. Press the VOLUME UP or VOLUME DOWN button right away.
Making a call with Quick call
When the screen is off and HTC One is in sleep mode, easily make a call by
just swiping and using voice commands.
§ Make sure Motion Launch gestures and Quick call are turned on in
Settings > Display & gestures > Motion Launch gestures.
§ If you've set a screen lock with credentials, you'll be asked to
provide your credentials first before you can make the call.
1. Lift the phone in portrait orientation.
Your first week with your new phone 63