Find "Manage Connections"
Press the Menu key.
Scroll to Manage Connections and press the Navigation key.
Activate or deactivate
Scroll to Mobile Network and press the Navigation key to activate or deactive flight mode.
When the box next to the menu item is unticked, flight mode is activated.
When the box next to the menu item is unticked, flight mode is activated.
Exit
Press Disconnect to return to standby mode.