The iPhone X has introduced the Side Button of the Swiss Army of Officers, which can perform many functions, such as summoning Siri and opening Apple Pay with click gestures. This has been translated into the iPhone X S
X  X  and iPhone X  R if you are from one with the Home To upgrade iPhone-equipped iPhone to one of these devices, you need to learn how to shut down your new device.
Unlike the iPhone 8 series and the following models use the latest flagship Apple now Side buttons are able to perform many different tasks to compensate for the lack of a home button, while the functions of Sleep / Wake Key are retained. Because of this, the simple process of shutting down your iPhone has become a little more complicated because you now need to use a keyboard shortcut.
Luckily, doing this important job is still relatively easy to do. You'll get used to it once you've done it a few times. In addition, Apple has baked in other options in iOS to turn off or restart your device for added convenience.
: Shut Down Using Your iPhone's Keys
Like the iPhone X, Press and Hold the Side Button on the iPhone X S X S Max, or iPhone X R will summon Siri instead of bringing the "turn off" option. To turn off your device, press and hold the page with the Volume Down or Volume Up buttons at the same time, then release when you see the message "Turn Off". A bar will appear on the display of the iPhone.
It's worth noting that pressing and releasing both the volume up and pager keys quickly causes your iPhone to take a screenshot and instead display the option to shut down the device 2: Shut down from the Settings menu
In addition to Hardware shutting down your iPhone, you can now also shut down your iPhone thanks to an option that is available in the App Settings. To do this, navigate to the General page of the Settings page, then scroll down and click Shut down to bring up the Power Off option.
Option 3: Restart using the buttons of your iPhone  After turning off your iPhone X S X S Max, or iPhone X R You can easily turn it back on by using the Hold down side key for a few seconds until the Apple Boot screen pops up. You can also turn on your handset by connecting it to your Lightning cable to charge it or connect to your computer.
Option 4: Restart with AssistiveTouch
If the above options are not enough, you can now restart your iPhone while using AssistiveTouch. The feature now comes with a "reboot" option that was introduced in iOS 11, and this has been transferred to iOS 12 in . This option is the quickest way to reboot as long as AssistiveTouch is assigned to the Triple-click the side-key combination