Choosing a phone's operating system is very much like picking between of Mac or PC computer. Each operating system, or OS, can do basically the same things – they all make call, they all have apps. But each has its own focus.
Apple's iOS: The iPhone really defined the look and feel of modern smart phones. It defined what phones should look like – with dimensions similar to a touch screen that takes up one entire side of the device, a home page Apple set the standard for a large touch screen, a home page filled with apps, and controls that revolved around pinch, tap, and swipe. Svelte has the device may be, the iPhone is all about apps.