HT204266: Use the App Store on your iOS devices, Apple TV, or computer
Learn about Use the App Store on your iOS devices, Apple TV, or computer
Q: change countries in itunes
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Nov 14, 2012 1:22 PMby Limnos,App Store Frequently Asked Questions (FAQ) - http://support.apple.com/kb/HT2001 when using iTunes --> "To change countries, scroll to the end of the iTunes Store home page and click the flag indicating the current country. To choose a different country, click the appropriate flag."
iOS: Changing the signed-in iTunes Store account - http://support.apple.com/kb/HT1311 - Change your iTunes Store country: "Sign in to the account for the iTunes Store region you'd like to use. Tap Settings > iTunes & App Stores > Apple ID: > View Apple ID > Country/Region."
You will, of course, need to change your address and enter valid credit card information after you have changed the settings.
iTunes Store: Changing Account Information - http://support.apple.com/kb/HT1918
Further tips on changing country - https://discussions.apple.com/message/20029737 - problems you encounter when changing iTunes country
