Samsung SCH-R250ZRAMTR - Manual (Page 26)

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Backlights
Backlights illuminate the displays and the keypad. When you press
any key or open the phone, the backlights come on. They go off when
no keys are pressed within a period of time set in the Backlight
menu.
Note: During a phone call, the display backlight turns off after 10 seconds to
conserve battery power, regardless of the Backlight setting.
For more information, refer to “Backlight” on page 125.