HTC One User Manual page 50

50 Your first week with your new phone
Notifications panel
Notification icons inform you of new messages, calendar events, alarms,
and activities in progress such as files downloading.
When you see notification icons, open the Notifications panel to check out
details of the notifications that you've received. You can also quickly
access settings from the Notifications panel.
1. To open the Notifications panel, slide down from the top of the
screen.
If you have several notifications, scroll down the screen to see them
all.