Apple Watch Series 5 International use
Hi, Currently I'm in the states and would like to get the GPS and Cell version of the Series 5.
Would this watch be able to work on the mobile network back in Australia?
Apple Watch
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No. The Apple Watch cellular radios are regional. The North American (Mexico, U.S., Canada) radios are different from Australia.
Cellular Carriers that support the Apple Watch, which models, the radio frequencies each model uses, and the country where they offer service:
https://www.apple.com/watch/cellular
Also you would have warranty issues, if anything went wrong with your Apple Watch. You would have to return to the U.S. to get it repaired.