ATu0026T has begun activating eSim support for iPhone XS and XR. ATu0026T is also the first major US carrier to offer eSim support on iPhones. In a support document updated today
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ATu0026T explains how it works. Dual SIM and Dual Standby support allows you to have 2 active SIM cards on a single phone. The iPhone XS and XR are both listed as compatible devices.