Is it possible to change the region on a Nintendo 3DS? – Yes, it is possible. However, the American and European 3DS contains different country/region listings. After changing the region of the Nintendo 3DS, the user will have access to its eShop.
How To Change Nintendo 3DS eShop Region :
Note : If you change your region to the United States or the United Kingdom (for example), you will be required to enter a zip code or postal code when making a purchase, adding funds to your account or downloading a free game demo.