Some locations may require you to turn off your phone’s wireless connections by placing your phone in Airplane mode.
Press and hold the Power/Lock Key , then tap Turn on Airplane mode in the Dialog box that appears.
OR
From the Home screen, tap the Menu Key > System settings > Networks tab > Airplane mode > OK.
OR
Drag the Status Bar downward, then tap Airplane mode (in the Quick settings bar at the top of the screen).
Each of these access methods toggle the setting on or off.