There are several stories available all over the Internet of people traveling abroad, and later discovering that they had phone bills that cost thousands of dollars. This happen because they were using data services while outside their carrier’s network, and didn't have the appropreiate plan.
To protect yourself, make sure Turn Data Roaming off. In Settings, choose General > Network and turn Data Roaming OFF.
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To protect yourself, make sure Turn Data Roaming off. In Settings, choose General > Network and turn Data Roaming OFF.
Note: By following these instructions, you will disable email, web browsing, and other data services when you're outside your carrier’s network.