If you want full compatibility for overseas software, you still need an Apple device. But there's a problem: the Chinese version of Apple has many features cut, such as AI. Another issue is eSIM—American versions of Apple iPhones can support up to 8 eSIM profiles, but the Chinese version doesn't have eSIM functionality. Actually, eSIM cards are not expensive, and many apps require verification with a foreign phone number, which can be quite troublesome. The Chinese version of the Apple Watch also has many features cut, so if possible, you might consider getting an American version as a backup device. Here's a channel you can check out.