Samsung SCH i830 - Manual (Page 20)

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Section 2
Closed View of Your Phone
Key Functions
1. IrDA/LED: Used to exchange data and information
between your phone and another device using infrared
signaling. Also indicates when certain features are active
on your phone such as Bluetooth wireless technology.
2. Context Menu Key: Launches menus or other option
screens for the currently highlighted choice on your
display.