User Guide

Restarting and Resetting iPhone
If something isn’t working right, try restarting iPhone, force quitting an app, or
resetting iPhone.
Restart iPhone: Press and hold the On/O Sleep/Wake button until the red slider
appears. Slide your nger across the slider to turn o iPhone. To turn iPhone back on,
press and hold the On/O Sleep/Wake button until the Apple logo appears.
If you can’t turn o iPhone or if the problem continues, you may need to reset iPhone.
A reset should be done only if turning iPhone o and on doesn’t resolve the problem.
Force quit an app: Press and hold the On/O Sleep/Wake button for a few seconds
until a red slider appears, then press and hold the Home button until the app quits.
On iPhone 3GS or later, you can also remove an app from the recents list to force it to
quit. See “Opening and Switching Apps” on page 28.
Reset iPhone: Press and hold the On/O 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, “ Support and Other
Information,” on page 242.
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Chapter 3 Basics