The LED shows a variety of things from charging status to notifications in various colors, but I've not found an application that changes it's behavior though I've tried apps I've used in the past on other phones. (I've also found no documentation on the light and it's operation from LG.) Until the 3rd party developers can work this out, I'm relying on sound to alert me to missed calls and such. "Easy Reminder" is a good free app that provides repeating sounds at user defined intervals for missed calls. (It has a light feature too, but it doesn't seem to work on the Revo.) It will also remind you of missed SMS's too, but I use the functionality in the messaging app I use (GO SMS Pro) to do that. - MarkC