Apple iPhone/iPhone 3G (User manual) - Manual (Page 46)

International Calls
iPhone is a UMTS/HSDPA (850, 1900, 2100 MHz) and a GSM (850, 900, 1800, 1900 MHz)
phone, ensuring broad international coverage.
Making International Calls from Your Home Area
For information about making international calls from your home area, including rates
and other charges that may apply, contact your carrier or go to your carrier’s website.
Using iPhone Abroad
You can use iPhone to make calls in many countries around the world. You must first
enable your carrier’s service plan for international roaming.
Enable international roaming: Contact your carrier.
Set iPhone to add the correct prefix when dialing from another country: In Settings,
tap Phone, then turn International Assist on. This lets you make calls to your home
country using the numbers in your contacts and favorites, without having to add a
prefix or your country code.
1
When you make a call using International Assist, “International Assist” appears on the
iPhone screen, alternating with the “calling ...” message, until your call is connected.
Set the carrier to use: In Settings, tap Carrier, then select the carrier you prefer. This
option is available only when you’re traveling outside your carrier’s network. You can
make calls only on carriers that have roaming agreements with your iPhone service
provider. For more information, see “Carrier” on page 101.
Important: Voice and data roaming charges may apply. To avoid data roaming charges,
turn Data Roaming off.
Turn Data Roaming on or off: In Settings, choose General > Network and turn Data
Roaming on or off. Data Roaming is turned off by default.
Turning Data Roaming off helps to avoid data roaming charges when traveling outside
your carrier’s network by disabling data transmission over the cellular network. You can
still access the Internet if you have a Wi-Fi connection. If Wi-Fi network access is not
available, however, you cannot:
Send or receive email 
Browse the Internet 
Sync your contacts, calendars, or bookmarks with MobileMe or Exchange 
Stream YouTube videos 
Get stock quotes 
Get map locations 
Get weather reports 
Purchase music or applications 
1 Not available in all areas.
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