Early users of Windows Phone 7 might know the pain they suffered: it would be very difficult if they wanted to change their phone store area or the language environment. In fact, the live account National language attribute is used in a store in Windows Phone 7, and once the user has set up the country where the account is located, the user will never be able to make changes to the content unless they register another one.
The situation has been improved at this time. Foreign media reported that for Windows Phone8, if they want to change the language environment of their phones, it can be easily done. This will no longer be a problem in your live/Microsoft/Xbox Account registration process, it is important for you to select the settings to activate the mobile phone country/region. So, for example, even if your residential address is in the UK, you can choose the United States as the default area that you will be applying for sale and use in the U.S. market. Of course, there may be some problems, such as the payment application that the credit card is registered in the United States, but this does not affect your development work, and the free application will perform better in this area because it does not involve payment.
You can actually change your phone's location settings and restart your phone and start using a completely different store. You don't need to reset your phone for this.
It may be that these people want to have some specific applications, or go to many places, or want to use a local application to visit a site outside the United States to get some real good news. In both cases, the Windows Phone 8-Country Mall switch is really good news.