What do the icons on my phone mean?

At the top of the screen, icons on the left notify you about new messages or events (flick the bar down for details). Icons on the right tell you about phone status.
Notification icons report the arrival of new messages, calendar events, alarms, as well as ongoing events, such as when call forwarding is on or the current call status. When you receive a notification, its icon and a brief summary appear in the status
bar, and then is replaced just by its icon.
You can open the Notifications panel to view a list of all your notifications. Applications whose activities produce notifications, such as Gmail and Google Talk, have their own settings you can use to configure whether and how they send
notifications.