Apple Watch SE
Since I want to buy an Apple Watch SE (GPS + Cellular) right now in Dubai, and I live in Europe, will I be able to use Cellular in Europe on another carrier when I return back?
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There are 2 Apple Watch cellular radios
• Canada, U.S. Mexico, Puerto Rico
• The rest of the world
Carriers will not attempt to connect to an Apple Watch that does not use the correct radio.
If you do not get your Apple Watch in your own country, you may have to return the Apple Watch to the country where purchased to get warranty service.
If you do not get your Apple Watch in your own country, there may be country specific restrictions in the installed Apple Watch software that prevent features from working when you get home.
https://www.apple.com/watchos/feature-availability
Dubai may have feature restrictions that you would not have if you purchased your Apple Watch in Europe