If you are travelling outside the US with the iPhone, you may have to shell out heavy international roaming charges to AT&T since the iPhone does not accept GSM SIM cards of other cellular operators yet. But since the iPhone is also a Wi-Fi computer, you can make phone calls on your iPhone via the internet.
For email and the Web, the best bet for iPhone owners is to avoid using cellular networks and employ the phone’s Wi-Fi capability, which can cost nothing extra. Try to find a free or reasonably priced Wi-Fi hot spot in which to check email and do Web browsing. You may even be able to make cheap voice calls this way using Internet-based calling services like JaJah (mobile.jajah.com) which, in my domestic tests, worked properly via the iPhone’s Web browser.
However, if you need to check email constantly or frequently, you are unlikely to be able to depend solely on the Wi-Fi method. You can rely on AT&T roaming to do this over foreign cellular services, but, as with the voice call situation, it will cost a fortune. Link.
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