Apple iPhone iOS 5.1 - Manual (Page 158)

Settings
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Settings lets you configure iPhone, set app options, add accounts, and enter other preferences.
Airplane mode
Airplane mode disables the wireless features in order to reduce potential interference with aircraft
operation and other electrical equipment.
Turn on airplane mode: Go to Settings and turn on airplane mode.
When airplane mode is on, appears in the status bar at the top of the screen. No phone, Wi-Fi,
or Bluetooth signals are emitted from iPhone, and GPS reception is turned off. You won’t be able
to use apps or features that depend on these signals, such as connecting to the Internet, placing
or receiving phone calls or messages, getting visual voicemail, and so on.
If allowed by the aircraft operator and applicable laws and regulations, you can continue to listen
to music, watch videos, browse email, calendar, and other data you’ve previously received, and use
apps that don’t require an Internet connection.
If Wi-Fi is available and allowed by the aircraft operator and applicable laws and regulations, go to
Settings > Wi-Fi to turn it on. You can turn on BlueTooth in Settings > General > BlueTooth.
Wi-Fi
Joining Wi-Fi networks
Wi-Fi settings determine whether iPhone uses local Wi-Fi networks to connect to the Internet.
When iPhone is joined to a Wi-Fi network, the Wi-Fi icon in the status bar at the top of the
screen shows signal strength. The more bars you see, the stronger the signal. If no Wi-Fi networks
are available, or if you’ve turned Wi-Fi off, then iPhone connects to the Internet via your cellular
data network when available.
Once you join a Wi-Fi network, iPhone automatically connects to it whenever the network is in
range. If more than one previously used network is in range, iPhone joins the one last used.
You can also use iPhone to set up a new AirPort base station that provides Wi-Fi services to your
home or office. See “Setting up an AirPort base station” on page 159.
Turn Wi-Fi on or off: Go to Settings > Wi-Fi.
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