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Indicate Bluetooth
Indicates a headset is connected to the phone.
Indicates vibration mode has been activated.
Keypad has been locked.
Indicates battery power level.
1.4 Screen background light
Background light can illuminate the screen. When you power on your
cell phone, background light will turn on for a certain period. If no key is
pressed within the period, the background light will turn off
automatically so as to save battery.