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Sometimes when you change the settings on an iPhone or install new programs, these changes interfere with one another and cause your iPhone to act erratically or cause programs to freeze or hang. If this happens, you may need to reset one or more of the following parts of your iPhone from the Reset screen:
Reset All Settings This option leaves your data (songs, video, pictures, and so on) alone but restores your iPhone to its original factory settings.
Erase All Content and Settings This option wipes out your entire iPhone and restores it to its original factory settings.
Reset Network Settings This option resets all your network settings including passwords for accessing Wi-Fi networks.
Reset Keyboard Dictionary This option wipes out any words you may have stored in the iPhone's dictionary and returns the virtual keyboard to its original factory settings.
Reset Home Screen Layout This option returns your Home screen to its original factory layout.
Reset Location Warnings This option wipes out any stored information about your current location.