Using Airplane Mode
Although there’s a debate whether devices such as iPhone pose any real danger to the operation of aircraft, there’s no reason to run any risk by using iPhone while you are on an airplane. (Besides, not following crew instructions on airplanes can lead you to less-than-desirable situations.) When you place iPhone in Airplane mode, its transmitter and receivers are disabled so that it poses no threat to the operation of aircraft. Of course, when you have permission to do so, you can use iPhone for iPod functions as well as all the other features that don’t require connection to a network.
To put iPhone in Airplane mode, move to the Settings screen and press the OFF button next to Airplane Mode. The OFF button becomes ON; all connections to network servers, and iPhone goes into quiet mode in which it doesn’t broadcast or receive any signals.
In Airplane mode, you can use iPhone for various functions, such as iPod, photos, and so on. To turn Airplane mode off, move to the Settings screen and press the Airplane Mode OFF button, which then becomes the ON button. iPhone resumes transmitting and receiving signals.