Apple iPhone 4G - Manual (Page 22)

Disconnecting iPhone from Your Computer
You can disconnect iPhone from your computer at any time. However, if you
disconnect it while a sync is in progress, some data may not get synced until the next
time you connect iPhone to your computer.
When iPhone is syncing with your computer, iPhone shows “Sync in Progress.” If you
disconnect iPhone before it finishes syncing, some data may not get transferred. When
the sync is complete, iTunes shows “iPhone sync is complete.”
Cancel a sync: Drag the slider on iPhone.
If you get a call during a sync, the sync is canceled and you can disconnect iPhone to
answer the call. Connect iPhone after the call to finish syncing.
Connecting to the Internet
iPhone connects to the Internet whenever you use Mail, Safari, YouTube, Stocks, Maps,
Weather, the App Store, or the iTunes Store.
How iPhone Connects to the Internet
iPhone connects to the Internet using either a Wi-Fi network or a cellular data network.
iPhone does the following, in order, until connected:
Connects over the last Wi-Fi  network you used that’s available.
If no previously used Wi-Fi networks are available, iPhone shows a list of Wi-Fi Â
networks in range. Tap a network and, if necessary, enter the password to join.
Networks that require a password show the lock icon next to them. You can
prevent iPhone from automatically showing available networks. See “Wi-Fi” on
page 189.
If no Wi-Fi networks are available or you choose not to join any, iPhone connects to
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the Internet over a cellular data network ( , , or ). You can prevent iPhone from
using cellular data in Settings. See “Network” on page 193.
If a Wi-Fi network or a cellular data network isn’t available, iPhone can’t connect to
the Internet.
Note: The 3G (UMTS) cellular network supports simultaneous voice and data
communications on GSM models. For all other network connections (EDGE or GPRS
on GSM models, or EV-DO or 1xRTT on a CDMA model), you can’t use Internet services
while you’re on the phone unless iPhone also has a Wi-Fi connection to the Internet.
Many Wi-Fi networks can be used free of charge including, in some countries or
regions, Wi-Fi hotspots provided by your iPhone carrier. Some Wi-Fi networks require
a fee. To join a Wi-Fi network at a hotspot where charges apply, you can usually open
Safari to see a webpage that allows you to sign up for service.
22 Chapter 2 Getting Started