4. BlackBerry

Here we have BlackBerry OS, the property of  Research In Motion (RIM) first released in 1999 and of course developed for ONLY BlackBerry smartphones. Unlike many other operating systems, BlakBerry is really different in interface style. That probably is because of BlackBerry smartphone design, which usually comes with a trackball for moving on the menu and a qwerty keyboard. The latest version is BlackBerry 10. However, bad news for those who love this OS is that the company has announced they will be abandoning the BB10 OS in favour of Android for 2016.

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