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iOS 7 is a free download, which is delivered over-the-air. This means that if you haven’t already got iOS 7 running on your device, you can download it without having to plug it into a computer by going to Settings > General > Software Update and following the instructions. Be sure that your iPhone is either connected to a power source or has a relatively full battery before attempting the update.
Credit : http://www.makeuseof.com/pages/your-guide-to-ios7