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pppcx 国内买的 air 可以用国外的 esim 的,只是激活的时候需要物理在外面
Traveling with your iPhone outside of China mainland
When traveling outside of China mainland, you can activate an eSIM from a local carrier on your iPhone Air, model A3518 that was purchased in China mainland. To do so, you must have location services enabled. eSIMs from non-China mainland carriers can't be installed while located in China mainland.