Apple iPhone/iPhone 3G (User manual) - Manual (Page 34)

Restarting and Resetting iPhone
If something is not working right, restarting or resetting iPhone will likely solve the
problem.
Restart iPhone: Press and hold the Sleep/Wake button until the red slider appears.
Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and
hold the Sleep/Wake until the Apple logo appears.
Reset iPhone: Press and hold the Sleep/Wake button and the Home button at the
same time for at least ten seconds, until the Apple logo appears.
For more troubleshooting suggestions, see Appendix A, “Troubleshooting,” on page 131.
34 Chapter 2 Basics