HTC One User Manual page 33

Note: The Auto-rotate screen option in Settings > D isplay, gestures & buttons needs to be
selected for the screen orientation to automatically change.
The TalkBack accessibility feature works best if you turn off auto-rotate. For details, see Navigate
Your Phone with TalkBack.
Flip to Silence
When a call comes in, you can turn your over to mute it.
Pick Up to Lower Volume
In a business meeting or restaurant, pick HTC One up when a call comes in to lower the ringtone
volume.
Set Volume to Automatically Increase while in Your Pocket or Bag
You can set HTC One to recognize when it's in your bag or pocket and raise the ringtone volume so
that you can hear it in noisy environments.
Phone Basics 20