How is NSLocaleCountryCode determined?

How is th开发者_StackOverflow社区e NSLocaleCountryCode determined by the iPhone OS in versions greater than 3.0?

Can it be changed by the user?

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A user can change their locale on the iPhone by going to Settings\General\International and choosing values for "Language" and "Region Format."

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Yes, the locale depends on what language and region setting the user specifies.

Example:

Language: English Region: United Kingdom Locale: en_gb

Language: English Region: United States Locale: en_us