To turn off an iPhone 11, press and hold the Volume Up button and the Side button simultaneously until a slider appears. Then, drag the "slide to power off" slider to the right to turn off the phone. Alternatively, go to Settings
General > Shut Down, then drag the slider to power off. To turn the phone back on, press and hold the Side button until the Apple logo appears. These instructions work on iPhone 11 running iOS 17 and other similar models as well.
