If you find yourself moving from one country to another, you will certainly bring some belongings with you (unless you’re an ascetic). But what of your digital goods? Items you’ve downloaded are typically transportable, but those that you’ve purchased and aren’t currently installed on a device you own could lag behind.
Apple relies on a billing address for purchases across all its product lines—App Store, iTunes Store, and more—to decide in which country you reside. If you start in one nation and move to another, shifting your billing details along the way, you could find yourself locked out from some previous purchases.
To shift the country of your Apple ID, you can follow Apple’s detailed instructions on a support page. This boils down to a few points, however: