Series 40, often shortened as S40, is a software platform and application user interface (UI) software on Nokia's broad range of mid-tier feature phones, as well as on some of the Vertu line of luxury phones. It was one of the world's most widely used mobile phone platforms and found in hundreds of millions of devices. Nokia announced on 25 January 2012 that the company has sold over 1.5 billion Series 40 devices. S40 has more features than the Series 30 platform, which is more basic. They are not used for smartphones, in which Nokia primarily uses Windows Phone, and until 2012 Symbian. However, in 2012 and 2013, several Series 40 phones from the Asha line, such as the 308, 309 and 311, have been advertised as "smartphones" although they do not actually support smartphone features like mul