iOS (originally iPhone OS) is a mobile
operating system created and developed by Apple Inc. and distributed
exclusively for Apple hardware. It is the operating system that
presently powers many of the company's mobile devices, including the iPhone, iPad, and iPod touch.
Windows Phone (WP) is a family of mobile operating systems developed by Microsoft for smartphones as the replacement successor to Windows Mobile and Zune. Windows Phone features a new user interface derived from Metro design language. Unlike Windows Mobile, it is primarily aimed at the consumer market rather than the enterprise market.It was first launched in October 2010 with Windows Phone 7.Windows Phone 8.1 was the last public release of the operating system, released to manufacturing on April 14, 2014.Windows Phone has been succeeded by Windows 10 Mobile, with the Windows Phone name being phased out in favor of branding the platform as an edition of Windows 10.
BlackBerry was a line of wireless handheld devices (commonly called smartphones) and services designed and marketed by BlackBerry Limited, formerly known as Research In Motion Limited (RIM).The very first RIM device was the Inter@ctive Pager 900, a clamshell-type device that allowed two-way paging, announced on September 18, 1996.After the success of the 900, the Inter@ctive Pager 800 was created for IBM, which bought US$10 million worth of them on February 4, 1998.The next device to be released was the Inter@ctive Pager 950, on August 26, 1998. The very first device to carry the BlackBerry name was the BlackBerry 850, an email pager, released January 19, 1999. Although identical in appearance to the 950, the 850 was the first device to integrate email and the name Inter@ctive Pager was no longer used to brand the device.