To turn off a phone, the specific method depends on the device brand and model:

• For Samsung Galaxy phones, press and hold the side key and volume down button simultaneously until the power off menu appears, then select "Power off." Alternatively, you can swipe down twice from the top of the screen to access the quick settings and tap the power icon to select "Power off."
• For Google Pixel phones, press and hold the power and volume up buttons simultaneously until the power dialog appears, then tap "Power off." Older Pixel phones may only require holding the power button.
• For Motorola phones, press and hold the power and volume up buttons simultaneously until the power dialog appears, then tap "Power off."
• For iPhones with Face ID, simultaneously press and hold the side button and either volume button until the slider appears, then drag the "Power Off" slider. For iPhones with a Home button, press and hold the side button and drag the slider.
• General Android phones often require pressing and holding the power button or pressing the power button and one of the volume buttons to bring up the power menu to select "Power off."

If the physical buttons are broken or unresponsive, many phones also offer a power off option accessible by swiping down the notification panel and tapping the power icon.

For detailed steps tailored to a specific phone model, please specify the device brand or type.