What is the iPhone X side button?
Previously the Sleep/Wake button was also the power button, now it has been renamed as the Side button. As you may have noticed, pressing and holding the side button on iPhone X, XS, XS Max, and XR activates Siri. So there's one extra step to getting your iPhone to power down.
Does iPhone have X button?
Press the Home button once to go to the Home screen. Press the Home button twice to bring up the App Switcher. On iPhone X and later, and on iPhone SE (3rd generation), press and hold the side button and one of the volume buttons to restart your iPhone.