››Switch to Silent mode
To mute or unmute your device, do one of the following: ●● In Menu mode, select Keypad, and then tap and hold 
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Open the notifications panel from the top of the screen and select Sound & vibration.
In Menu mode, select Settings → Sound and drag the slider next to Sound.
››Select a wallpaper for the idle screen
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In Menu mode, select Settings → Display → Wallpaper.
Select an image folder → an image. Select Set.
Samsung is not responsible for any use of default images or wallpapers provided on your device.
››Adjust the brightness of the display
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In Menu mode, select Settings → Display.
Drag the slider under Brightness to adjust the level of brightness.
The brightness level of the display will affect how quickly the device consumes battery power.
››Lock your device
You can lock your device by activating the device password.
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In Menu mode, select Settings → General → Security.
Drag the slider next to Phone lock.
Enter a new 4- to
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