Your iPhone's Settings Menu Options
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Check out Settings on your iPhone and Airplane mode.
If you scroll down towards the bottom of the Settings list, you will see settings that pertain to Twitter and Facebook, and settings that pertain to some of the specific apps you’ve added to the iPhone.
Using a cell phone on an airplane is a no-no. But there’s nothing verboten about using an iPod on a plane to listen to music, watch videos, and peek at pictures — at least, after the craft has reached cruising altitude.
So how do you take advantage of the iPhone’s built-in Music player (among other capabilities) while temporarily turning off its phone, e-mail, and Internet functions? The answer is, by turning on airplane mode.
To do so, merely tap airplane mode on the Settings screen to display On (rather than Off). The good news is that airplane mode keeps your battery running longer — particularly useful if your flight is taking you halfway around the world.