If you have an iPhone 6S or older, do the following: Hold down the POWER button and the HOME button simultaneously until the screen goes out and the Apple logo appears.



If you have an iPhone 7 or 7S you do it by holding down the POWER and the VOLUME DOWN button simultaneously until the screen goes out and the Apple logo appears.



If you have an iPhone 8 or later, do it this way:

  1. Briefly press the VOLUME UP button.
  2. Briefly press the VOLUME DOWN button.
  3. Press and hold the POWER button until the phone restarts - displaying the Apple logo (approximately 15 seconds).