Although many may not use it, let's not forget the green LED used as the coverage indicator: Flashing LED on the BlackBerry smartphone
The light-emitting diode (LED) on the top of the BlackBerry smartphone flashes different colors to indicate various states. The table below describes what the colors represent.
Green The BlackBerry smartphone is in an area of wireless coverage.
Red A new message has arrived.
Amber The battery is low.
Blue The BlackBerry smartphone is connected to a device enabled with Bluetooth® wireless technology.