Nokia Lumia 620 - What do the status bar icons on my Nokia Lumia
phone mean?  With the icons on the status bar at the top of the
screen you can get information for example about network
connectivity and signal strength, battery power and time. When
you want the status bar to display, tap the top of your
screen. The status bar will also appear momentarily when things
change on your phone. This way you can get specific information
about your phone. For example, if your battery is running low,
the status bar will display with the low battery icon on it.