Here is a tutorial on how to turn your iPhone on or off:
To turn your iPhone on:
Step 1: Press and hold the Side button The Side button is located on the right side of your iPhone (or the top button on older models). Press and hold this button until the Apple logo appears on the screen.
Step 2: Release the button Once you see the Apple logo, release the Side button. Your iPhone will now turn on.
To turn your iPhone off:
Step 1: Press and hold the Side button and either volume button Press and hold the Side button and either volume button (up or down) at the same time until the “slide to power off” slider appears on the screen.
Step 2: Slide to power off Swipe the “slide to power off” slider to the right. Your iPhone will now turn off.
Alternatively, you can also turn your iPhone off by going to Settings > General > Shut Down and then sliding the “slide to power off” slider to the right.
That’s it! You now know how to turn your iPhone on or off. Whether you need to restart your iPhone or power it down completely, these steps will help you do so quickly and easily.