How to add simulator iPhone XS in Xcode 9.2 also iPhone XS max

Simple solution:

1. Open Xcode.
2. Select the “Window” menu.
3. Select “Devices and Simulators”.
4. Select Simulators tab.
5. Click on the “+” icon at the left bottom.
6. Choose the desired device & preferred iOS.
7. Click “Create”.
8. Enjoy :).