Apple allows only a decent set of devices to run the new firmware, including iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPad 2, New iPad and iPod touch 4G. Here's the complete list of features, provided by Apple, which will be and will not be available on various devices.
Quoted from iOS 6 Features Compatibility List For Supported Devices: Will Your iPhone, iPad, iPod Touch Get All The New Elements? on ipad 3 features – Yahoo! News Search Results
With iOS 11, new features and capabilities bring iPad to life like never before. And make iPhone more essential than ever to your everyday life. Everything you need to know about iOS 11, including the latest version, bug fixes, new features and compatible devices Here are AirPlay 2 on 11 and macOS High Sierra , device and speakers , and more. In short, here's everything you need Complete guide to iOS 6 When Apple announced that , the latest version of its mobile OS, would work with older devices all of the way back to the iPhone 3GS Tags: complete, guide, device, compatibility, With 11, new and capabilities bring iPad to life like never before. And make iPhone more essential than ever to your everyday life. 11, released on September 19, introduces major design changes, new app , and a complete interface overhaul for the iPad.