gadgetblog

Well here is a tiny phone light that will illuminate and flash prightly when you receive a call regardless of the mode your phone is in. In order for this to work the phone does need to be on the Global System for Mobile Communication (GSM) standard. But a lot of carriers provide this, just check to see if your phone is already configured. Just looked on the Wiki page and they estimate 82% of all phones use this standard. So chances are yours does. This is not compatible with Code Division Multiple Access (CDMA)

Find this at X-treme Geek