Some locations may require you to switch off data connections. Instead of turning off your device, you can set it to Aeroplane Mode.
1. From the Home Screen press Navi-key (Up) to display Aeroplane Mode menu.
2. Press OK to select Menu.
3. Press the Navi-Key (Up) or (Down) to select On/Off, press OK to select.
Note: The flight mode will disconnect all your network data, Wi-Fi and connectivity connections. You can also access through Menu > Settings > Network & Connectivity > Aeroplane Mode.