How to restart iphone?

This is one of the most basic procedures with slight differences among the models of iPhones. Restarting an iPhone is done as explained below for the different models of iPhones.

iPhone X, 11, 12, 13, 14, and all newer models:
Press and Hold Buttons
You will press the Side Button at the right-hand side and then the Volume Up or Down button at the left-hand side of your iPhone together.
Slide to Power Off
Drag the power-off slider that appears on the screen to the right.
Turn It Back On:
Wait for the screen to go fully black, then press and hold the Side Button until the Apple logo appears.
For iPhone SE (2nd generation), 8, 7, and 6:
Press and Hold the Side Button:
Hold the Side Button until the power-off slider appears.
Slide to Power Off:
Drag the slider to the right to shut down the phone.
Turn It Back On:
Press and hold the Side Button until the Apple logo appears.
For iPhone SE (1st generation), 5, and earlier models:
Press and Hold the Top Button:
Hold the Top Button until the power-off slider appears.
Slide to Power Off:
Drag the slider to the right.
Turn It Back On:
Press and hold the Top Button until the Apple logo appears.
Force Restart (If the Phone is Unresponsive)
iPhone 8 and newer:
Quickly press and release the Volume Up button.
Press and release the Volume Down button quickly.
Press and hold the Side Button until the Apple logo appears.
iPhone 7 and 7 Plus:
Press and hold the Volume Down button and the Side Button at the same time.
Keep holding until the Apple logo appears.
iPhone 6s, SE (1st gen), and earlier:
Press and hold the Home Button and the Top/Side Button at the same time.
Keep holding until the Apple logo appears.