iPhone - FutureTG.com

Most of the items on the Settings page are doorways to other screens,
where you make the actual changes. When you’re finished inspecting or
changing the preference settings, you return to the main Settings screen
by tapping the Settings button in the upper-left corner.
In this book, you can read about the iPhone’s preference settings in the
appropriate spots—wherever they’re relevant. But so you’ll have it all in one
place, here’s an item-by-item walkthrough of the Settings application.
Airplane Mode
As you’re probably aware, you’re not allowed to use cellphones on airplanes.
According to legend (if not science), a cellphone’s radio can interfere with a
plane’s navigation equipment.
But the iPhone does a lot more than make calls. Are you supposed to deprive
yourself of all the music, videos, movies, and email that you could be using in
flight, just because cellphones are forbidden?
Nope. Just turn on Airplane mode by tapping the Off button at the top of
the Settings list (so that the orange On button appears). Now it’s safe (and
permitted) to use the iPhone in flight—at least after takeoff, when you hear
the announcement about “approved electronics”—because the cellular and
Wi-Fi features of the iPhone are turned off completely. You can’t make calls or
get online, but you can do anything else in the iPhone’s bag of nonwireless
tricks.
Wi-Fi
Wi-Fi—wireless Internet networking—is one of the iPhone’s best features.
This item in Settings opens the Wi-Fi Networks screen, where you’ll find three
useful controls:
• Wi-Fi On/Off. If you don’t plan to use Wi-Fi, turning it off gets you a lot
more life out of each battery charge. Tap anywhere on this On/Off slider
to change its status.
Turning Airplane mode on automatically turns off the Wi-Fi antenna—but you
can turn Wi-Fi back on. That’s handy when you’re in one of those rare, amazing
airplanes with Wi-Fi on board.
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Chapter 16