When using your service outside the U.S., Puerto Rico or U.S. Virgin Islands (for either voice or data), international roaming rates apply.
How iPhone Users Can Minimize International Data Charges:
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Utilize WiFi, available in many international hotels, airports, and restaurants to browse the web or check email.
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Keep Data Roaming "OFF": Be sure to download the Version 1.1.1 upgrade to iPhone. This software update will enable the ability to turn on/off data roaming when traveling outside the U.S. By default, this setting will be in the "OFF" position. The path is: Settings > General > Network > Data Roaming.
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Turn off your phone's "auto check" function, and check email manually when needed, using WiFi.
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Reset the usage tracker to zero when you arrive overseas and monitor your data usage.
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Consider purchasing an international service plan that includes discounted international data usage. AT&T now offers two discount international data packages. The 20 MB package is $24.99; the 50 MB package is $59.99. See att.com/wirelessinternational for details and international roaming rates.