Apple Watch Ultra
Will a Japanese Apple Watch Ultra work in the US if I move back? I currently have T-Mobile in Japan so it doesn’t work.
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As a GPS watch, yes. As a Cellular Watch, likely not. An Apple Watch sold in Japan, is not provisioned for cellular bands in the US, Canada, Mexico and Puerto Rico. I'd be inclined to sell it to someone in Japan and buy one in the US when you move back.