How to erase your iOS device and then set it up as a new device or restore it from backups

Learn how to erase all of the data on your iPhone, iPad, or iPod touch and set it up as a new device or restore it from iCloud or iTunes backups. If you're having an issue with your iPhone, iPad or iPod touch, follow these troubleshooting steps to: Back-up your data before your erase your device. Erase your device. Set up your device as a new device, or restore your device from an iCloud backup or an iTunes backup. If you're going to give away or sell your iOS device, learn what to do before selling or giving away your iPhone, iPad, or iPod touch. Back-up your data Check for iOS software updates. Install them if available. Take a few minutes to transfer your content from your device to your computer to ensure that all of your critical data is safe. Back up your device before you erase it. Learn more about how to copy your backup to another folder, disk, or location for safekeeping. Erase your device Erasing all content and settings will delete all of the data from your device, including songs, videos, contacts, photos, calendar information, and anything else. All device settings are restored to their factory condition. To remove all settings and information from your device, tap Settings > General > Reset > Erase All Content and Settings. Learn more about "Erase All Content and Settings." SUMBER : http://support.apple.com/en-ca/HT4137