HTC One User Manual page 38

38 Your first week with your new phone
Set volume to automatically rise while in your pocket or bag
Rotate HTC One for a better view
On a noisy street and can't hear HTC One ringing
in your 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.
For many screens, you can
automatically change the
screen orientation from
portrait to landscape by
turning HTC One sideways.
When entering text, you can
turn HTC One sideways to
bring up a bigger keyboard.