The iPhone models currently sold on apple.com work with nano-SIM cards and eSIM voice and data plans from compatible carriers or providers.* And they work on many 4G LTE networks around the world. Contact service providers for details.
** The iPhone XS display has rounded corners that follow a beautiful curved design, and these corners are within a standard rectangle. When measured as a standard rectangular shape, the screen is 5.85 inches (iPhone XS) and 6.46 inches (iPhone XS Max) diagonally (actual viewable area is less).