Apple iPhone/iPhone 3G (User manual) - Manual (Page 131)

131
General
Low-Battery Image Appears
iPhone is low on power and needs to charge for up to ten minutes before you can use
it. For information about charging iPhone, see “Charging the Battery” on page 32.
or
iPhone Doesn’t Respond
iPhone may be low on power. Connect iPhone to your computer or to its power 
adapter to charge. See “Charging the Battery” on page 32.
Press and hold the Home
 button below the screen for at least six seconds, until
the application you were using quits.
If that doesn’t work, turn iPhone off and turn it on again. Press and hold the Sleep/

Wake button on top of iPhone for a few seconds until a red slider appears, and then
drag the slider. Then press and hold the Sleep/Wake button until the Apple logo
appears.
If that doesn’t work, reset iPhone. Press and hold both the Sleep/Wake button and

the Home button for at least ten seconds, until the Apple logo appears.
iPhone Still Doesn’t Respond After Reset
Reset iPhone settings. From the Home screen choose Settings > General > Reset 
> Reset All Settings. All your preferences are reset, but your data and media aren’t
deleted.
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Troubleshooting