Using iphone abroad
Are you wondering about how to use you iPhone when you are on business or travel abroad? iPhone can be used internationally. Here are some tips for you in advance. Use International settings to set the language for iPhone, turn keyboards for different languages on or off, and set the date, time, and telephone number formats for your region.
1. Set the language for iPhone:
In Settings, choose General > International > Language, choose the language you want to use, then tap Done.
2. Set the Voice Control language for iPhone:
In Settings, choose General > International > Voice Control, then choose the language you want to use (iPhone 3GS only).
3. Turn international keyboards on or off:
In Settings, choose General > International > Keyboards, and turn on the keyboards you want.
If more than one keyboard is turned on, tap 
to switch keyboards when you’re typing. When you tap the symbol, the name of the newly active keyboard appears briefly. See International Keyboards.
4. Set date, time, and telephone number formats:
In Settings, choose General > International > Region Format, and choose your region.
5. Enable international roaming:
Contact your carrier for information about availability and fees.
6. Set iPhone to add the correct prefix when dialing from another country:
In Settings > tap Phone > 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. International Assist works for U.S. telephone numbers only.
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.
NOTE: International Assist not available in all areas.
7. Set the carrier to use:
In Settings > tap Carrier > 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.
IMPORTANT: Voice and data roaming charges may apply. To avoid data roaming charges, turn Data Roaming off.
8. 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.
Other third-party applications that use data roaming may also be disabled.
If Data Roaming is turned off, you can still make and receive phone calls, and send and receive text messages. Voice roaming charges may apply. Visual voicemail is delivered if there’s no charge; if your carrier charges for delivery of visual voicemail when roaming, turning Data Roaming off prevents the delivery of visual voicemail.
To enable email, web browsing, and other data services, turn Data Roaming on.
IMPORTANT: If Data Roaming is turned on, you may incur charges when roaming outside your carrier’s network for the use of any of the features listed above, as well as for delivery of visual voicemail. Check with your carrier for information about roaming charges.
9. Get voicemail when visual voicemail isn’t available:
Dial your own number, or press and hold “1” on the keypad.
You can use Airplane Mode to turn off cellular services and then turn Wi-Fi on to get access to the Internet, while preventing voice roaming charges.
10. Use Airplane Mode to turn off cellular services:
In Settings, tap Airplane Mode to turn it on, then tap Wi-Fi and turn Wi-Fi on. See Airplane Mode.
Incoming phone calls will be sent to voicemail. To make and receive calls again and get your voicemail messages, turn Airplane Mode off.
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Personally if I am travelling for more than a week in a country i find it easier to just buy a local sim card to use whilst in the country, most places they are inexpensive and it saves on high costs.
I can agree with you no more. it is very economical to buy a local sim card in other countryies, especially in China. the fee is very cheap.