<P> In 2007 Apple introduced the iPhone and its operating system, iOS, which, like Mac OS X, is based on the Unix - like Darwin . In addition to these underpinnings, it also introduces a powerful and innovative graphic user interface--later also used for the tablet computer iPad . A year later, Android was introduced, based on a modified Linux kernel, and its own graphical user interface, and Microsoft re-entered this market with Windows Phone in 2010, due to be replaced by Windows 10 Mobile in 2015 . </P> <P> In addition to these, a wide range of other mobile operating systems are contending in this area . </P> <P> Operating systems originally ran directly on the hardware itself and provided services to applications, but with virtualization, the operating system itself runs under the control of a hypervisor, instead of being in direct control of the hardware . </P> <P> On mainframes IBM introduced the notion of a virtual machine in 1968 with CP / CMS on the IBM System / 360 Model 67, and extended this later in 1972 with Virtual Machine Facility / 370 (VM / 370) on System / 370 . </P>

Modal based on historical evolution of operating system