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Using Dual SIM with two nano-SIM cards and your iPhone XS Max or iPhone XR in China, Hong Kong, or Macau XS Max and iPhone XR purchased in mainland China, Hong Kong, and Macau can use two physical SIM cards. If you aren’t in mainland China, or if you’re in Hong Kong or Macau and have an iPhone XS, get help with Dual SIM with an eSIM.