To compete in developing markets, Microsoft launched various low- and mid-range devices—such as the Lumia 430 Dual SIM,[96][97] 532, 435, 640, 640 XL, and 540 Dual SIM—to boost Windows Phone sales and increase market share.[98][99] In Q2 2015, Lumia sold 10.5 million devices, compared to 8.2 million during the same quarter in the prior year.[100] As a consequence of the Microsoft Lumia 535 being as popular as its predecessor, the Nokia Lumia 520, in key markets such as India and Brazil,[101] Microsoft would not concentrate on releasing a high end Microsoft Lumia device until the launch of Windows 10.[102] In Q2 2015, feature phone sales declined year-over-year, with a total of 40 million being sold for a total revenue of $2.28 billion, and a gross margin of $330 million (14%), being significantly lower than previous years due to a global decline in the demand for feature phones in favour of smartphones.[103]