The steps are the same for all iPhone 15 models.
Drag theSlide to Power Offoption to the right.
When youre ready to turn your iPhone back on, press and hold theSidebutton.

This method is also considered a soft restart.
At the bottom, chooseShut Down.
To turn your iPhone back on, press and hold theSidebutton on the right.

Unable to turn your gear back on?
Look at ways tofix an iPhone that wont turn on.
This is called a force restart, force reset, or hard reset.

Press and release theVolume Upbutton on the left.
Press and releaseVolume Downbutton on the left.
Hold theSidebutton on the right.
When you see the Apple logo appear, release theSidebutton.