Easily wipe out all the data from your iOS device and set it up as good as new.
In case of non-responsive app or screen, one can simply press and hold the home button along with the power/sleep key together for 10 seconds. The device will then reboot. This method can be used with iPhone, iPod Touch and even on iPad.
In order to reset the iOS device in factory state, you need follow a simple processor right on the device but ensure you have a PC or Mac with iTunes installed on it. Before wiping all the data, you can take the backup of your contacts and other apps by connecting the iOS device to iTunes and sync it normally.
Here's the quick guide to reset your iOS device to factory state.
Open the Settings app and select the General option.
Scroll down and then select the Reset option.
From the available list of options, you can choose 'Erase All Content and Settings' to reset/format your iPhone, iPod Touch or iPad.
Do note that selecting the 'Erase All Content' option from settings will remove everything - your contacts, apps, and every setting. So the iOS device basically gets restored to factory state and will reboot with iTunes icon showing on the screen.
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