restore iphone
help me reset my iphone to factory settings so i can use it
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Restore your iPhone, iPad, or iPod to factory settings - "A factory restore erases the information and settings on your iPhone, iPad, or iPod and installs the latest version of iOS or iPod software." - http://support.apple.com/HT201252
You might instead wish to tell us what is wrong first. Typically doing a reset like that is only needed if you are giving away a device, not to cure a problem you have encountered in regular usage.