Turn off my phone

Hi there. On the iPhone XS (Your iPhone Model) you are able to press and hold the power button and volume docker for at least 3 seconds, then slide the Power Off button.

There is not a physical option to turn off your iPhone without the screen unless you switched the Siri button over to the power button.

same problem here on an iphone 8- screen smashed- can't switch off the alarm and it keeps ringing. is there an option to switch off the phone without using the screen e.g. through itunes or apple's website ?