Every smartphone depends on its operating system (OS) for its functionality, feel and specific look. A modern smartphone OS (at present) offers a good-designed range of functionality and features, a slick, as well as ‘extras’ to help in making it a distinctive one. Apple has got numerous success with the release of his first touchscreen device in 2007. The Apple’s operating system, iOS has introduced with the release of its first iPhone and then it also applied to iPods and iPads as well. Apple iPhone's success has revolutionised the mobile phone industry and set higher bars for other to get. Android and Windows mobile phones have gone through various makeovers, whereas, the Apple iOS system has kept nearly the same since its launch in 2007.
Apple products are known for their reputation of security. IPhones can run only Apple certified apps, whereas, in Android phones, there is an open platform. The latest OS running on Apple phones is iOS 9.3.1. This OS is more or less similar with Android’s OS. Instead of Android phones app drawer feature, it gives you just the app icon-filled home screen. This OS is the simplest while comparing to Android phones and Windows phones. This latest release of OS contains fixes for security issues and bugs. It was introduced with the release of iPhone 6 and iPhone 6s Plus and is even compatible with all versions of iPhones OS from the iPhone 4s onwards.