The biggest overhaul in iOS history is upon us, and brings about much new functionality and a brand new look. Here's what you should follow to get iOS 7 on your Apple iPhone 4, iPhone 4s or iPhone 5, your iPad 2, iPad 3 (new iPad), iPad 4, or iPad mini tablets, and your iPod touch 5th generation media player...
Source: http://www.phonearena.com/news/How-to-download-and-install-the-iOS-7-update-to-your-iPhone-iPad-or-iPod-touch_id47541
Source: http://www.phonearena.com/news/How-to-download-and-install-the-iOS-7-update-to-your-iPhone-iPad-or-iPod-touch_id47541