Apple iPhone/iPhone 3G (User manual) - Manual (Page 99)

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Settings allows you to customize iPhone applications, set the date and time, configure
your network connection, and enter other preferences for iPhone.
Airplane Mode
Airplane mode disables the wireless features of iPhone to avoid interfering with
aircraft operation and other electrical equipment.
Turn on airplane mode: Tap Settings and turn airplane mode on.
When airplane mode is on, appears in the status bar at the top of the screen. No
phone, radio, Wi-Fi, or Bluetooth signals are emitted from iPhone and GPS reception is
turned off, disabling many of iPhone’s features. You won’t be able to:
Make or receive phone calls 
Get visual voicemail 
Send or receive email 
Browse the Internet 
Sync your contacts, calendars, or bookmarks (MobileMe only) with MobileMe or 
Microsoft Exchange
Send or receive text messages

Stream YouTube videos 
Get stock quotes 
Get map locations 
Get weather reports 
Use the iTunes Wi-Fi Music Store or the App Store 
If allowed by the aircraft operator and applicable laws and regulations, you can
continue to use iPhone to:
Listen to music and watch video 
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Settings