BlackBerry is a line of smartphones and services designed and marketed by Canadian company BlackBerry Limited (formerly known as Research In Motion/RIM). This line traditionally uses a proprietary operating system developed by BB Limited known as BlackBerry OS. In 2013, BB introduced BB 10, a major revamp of the platform based on QNX operating system. In 2015, BB re-focused its business strategy and began to release Android-based smartphones, beginning with the BlackBerry Priv slider and then the BB DTEK50. On September 28, 2016, BB announced it would cease designing its own phones in favour of outsourcing to partners. However, BB has since lost its dominant position in the market due to the success of the Android and iOS platforms; the same numbers had fallen to 23 million in March 2016.