HTC Smart User Manual page 45

. Phone Status and Notifications
Below are some of the status icons and notification icons that you
may see in the status bar and on the lock screen.
Status icons
Full battery
Battery charging
Low battery
Very low battery
Maximum signal strength
Roaming
Phone connection is off
No SIM card inserted
3G available
3G connected
EDGE available
EDGE connected
HSDPA available
HSDPA connected
GPRS available
GPRS connected
No data connection
Chapter  Phone Basics 
Bluetooth on
Bluetooth visible
Bluetooth stereo headset connected
Bluetooth stereo music only
Bluetooth hands-free only
Sound on
Silent mode on
Vibration mode on
Call is in progress
Call on hold
Calls are forwarded
Mute
Wired headset connected
Speakerphone on
Alarm is set
Airplane mode