Find "Display"
Press the Navigation key.
Scroll to Settings and press the Navigation key.
Scroll to Phone settings and press the Navigation key.
Scroll to Display and press the Navigation key.
Select background image
Scroll to Wallpaper and press the Navigation key.
Highlight System or User defined and press the Navigation key.
If you select System:
Highlight any picture and press the Navigation key.
Press Navigation key right or Navigation key left to select the required background image.
Press the Navigation key.
If you select User defined:
Go to the required folder.
Go to the required folder.
Highlight the required background image and press the Navigation key.
Exit
Press Disconnect to return to standby mode.