Yes, the iPhone 15 is a dual-SIM iPhone with full support for nano-SIM and eSIM, just like the iPhone XS, XR, 11, SE (2020), 12, 13 and 14.
When you travel abroad to access the Internet at cost-saving prices, you can use two lines simultaneously. For instance, you can use your home-based SIM card provider for phone calls and SMS and a mobile data plans carrier such as Ubigi eSIM.
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Here’s the list of all eSIM compatible devices.