Apple Watch and iPhone
How can it be used in another country
iPhone 12 Pro Max
Apple Vision Pro is now available in the U.S.
How can it be used in another country
iPhone 12 Pro Max
If it is a GPS only watch then it should work in any country that the paired iPhone does. To change the country on your iPhone, see:
Change your Apple ID country or region - Apple Support
For a cellular watch, see:
Set up cellular on Apple Watch - Apple Support
If it is a GPS only watch then it should work in any country that the paired iPhone does. To change the country on your iPhone, see:
Change your Apple ID country or region - Apple Support
For a cellular watch, see:
Set up cellular on Apple Watch - Apple Support
If you mean while traveling (business or vacation), then the Apple Watch does NOT support cellular roaming.
While away from your Apple Watch cellular carrier, the Apple Watch will behave like a GPS only Apple Watch, and as long as your iPhone is nearby, provide all the same services. But you will not be able to make phone calls, nor stream music, etc… when away from your iPhone.
If you mean buy an Apple Watch in one country, but sign up with a cellular carrier in another country, then it depends on the 2 countries. There are 2 cellular radios. The one for North America (Canada, U.S., Mexico, Puerto Rico) and the rest of the world. You need the correct radio for the area the Apple Watch will be used in.
Apple Watch and iPhone