How do you reset an iPhone 4 without a computer?

How do you reset an iPhone 4 without a computer?
Force restarts are very simple and require no tools.

Step 1 How to Force Restart an iPhone 4. Press and hold the Home button. While holding the Home button, press and hold the Sleep/Wake button. Add Comment. 1024.
Continue holding both buttons for about 10 seconds, until the Apple logo appears. 4 comments. Add Comment. 1024.

Force restarts are very simple and require no tools.
  1. Step 1 How to Force Restart an iPhone 4. Press and hold the Home button. While holding the Home button, press and hold the Sleep/Wake button. Add Comment. 1024.
  2. Continue holding both buttons for about 10 seconds, until the Apple logo appears. 4 comments. Add Comment. 1024.