The ability to select between Yellow, Green, Cyan, Blue, Megenta, and Red external LED alerts aren't utilized by many app builders, but they come in handy to differentiate between different silent alerts.
The external LED alerts appear at the top right corner of the phone as two tiny ports of light..
Using them in conjunction with sound and vibration is useful when walking away from the phone and you don't want to log in to see if you missed a notification. They also can be used as a silent only notification.
An app like HI Yahoo, a Yahoo instant messenger app, gives you an option to choose any of the colors as an alert.
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