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The iPhone Xs, Xs Max, and XR have Dual SIM cards, which includes a nano-SIM and an eSIM. The eSIM is a digital SIM that allows your phone to have a second active cell plan from your carrier. Essentially, your phone will have two phone numbers. This is great if you want a business number separate from your personal number or are traveling out of the country and want to get a phone number from a local carrier without swapping out the physical SIM. Typically this feature only works with iOS 12.1 and later with a few carriers in the US. Verizon, AT&T, and T-Mobile currently support this feature with varying restrictions. Check with your carrier to understand how you can best use eSIM with your device. Below, I'll give a general overview of how to set up an eSIM.