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 (on the back of the phone), then tap Turn on Airplane mode in the Phone Options menu that appears.
OR
From the Home screen, touch and hold the Recent Apps Key (in the Touch Keys bar) > Settings > the Airplane mode switch (on the right side of the screen).
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.