My iphone 4 suddenly turned off and now its asking me to restore my phone

My iPhone 4 suddenly turned off without any notice and was dead.  I would hold the sleep and main button together and nothing would happen.  Once home, I connected it straight to the Adapter and now it is asking me to plug in itunes and 'Restore' my phone.  What could have happened?  Why is it doing this?  never happened before and dont now why it occured.  Please help!

Well if its the first time its probably nothing to worry about, things happen. If it happens again i would recommend uninstalling the last app you installed, if that fails take it to the apple store because it could be a hardware issue.

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    According to this article: http://support.apple.com/kb/TS3694#error21
    Error 21- These errors typically occur when security software interferes with the restore and update process. Use the steps to troubleshoot security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
    Also, check your hosts file to verify that it's not blocking iTunes from communicating with the update server. See the steps under the heading "Blocked by configuration (Mac OS X / Windows) > Rebuild network information > Mac OS X > The hosts file may also be blocking the iTunes Store." If you have software used to perform unauthorized modifications to the iOS device, uninstall this software prior to editing the hosts file to prevent that software from automatically modifying the hosts file again on restart.
    The error on the Mac is odd though. 2100 is not in the article. What version of the Mac Operating system are you running?

  • My Iphone 5 suddenly turned off and there is only the Itunes logo with the usb image and arrow key. I've now connected to Itunes but it doesn't work

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    Have a look through this Doc
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  • My iphone 4s suddenly turned off and plug in charger and iTunes shown

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    See Here for
    Frozen or unresponsive iPhone
    Try this First... You will Not Lose Any Data...
    Turn the Phone Off... ( if it isn’t already )
    Press and Hold the Sleep/Wake Button and the Home Button at the Same Time...
    Wait for the Apple logo to Appear and then Disappear...
    Usually takes about 15 - 20 Seconds... (But can take Longer...)
    Release the Buttons...
    Turn the Phone On...
    http://support.apple.com/kb/ht1430

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    See Here for
    Frozen or unresponsive iPhone
    Try this First... You will Not Lose Any Data...
    Turn the Phone Off... ( if it isn’t already )
    Press and Hold the Sleep/Wake Button and the Home Button at the Same Time...
    Wait for the Apple logo to Appear and then Disappear...
    Usually takes about 15 - 20 Seconds... (But can take Longer...)
    Release the Buttons...
    Turn the Phone On...
    http://support.apple.com/kb/ht1430

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    You have to enter the Apple ID and password. You are running into the Activation Lock
    iCloud: Find My iPhone Activation Lock in iOS 7
    Is there a way to find my Apple ID Name if I can't remember it?
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    Hi NWL1,
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    If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support
    Thanks for using Apple Support Communities.
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