Nokia Corporation is a Finnish multinational communications corporation that is headquartered in Keilaniemi, Espoo, a city neighbouring Finland's capital Helsinki. Nokia is engaged in the manufacturing of mobile devices and in converging Internet and communications industries, with over 132,000 employees in 120 countries, sales in more than 150 countries and global annual revenue of over €42 billion and operating profit of €2 billion as of 2010. It is the world's largest manufacturer of mobile phones: its global device market share was 31% in the fourth quarter 2010, up from an estimated 30% in third quarter of 2010 but down from an estimated 35% in the fourth quarter of 2009. Nokia's estimated share of the converged mobile device market was 31% in the fourth quarter, compared with 38% in the third quarter 2010. Nokia produces mobile devices for every major market segment and protocol, including GSM, CDMA, and W-CDMA (UMTS). Nokia offers Internet services such as applications, games, music, maps, media and messaging through its Ovi platform. Nokia's subsidiary Nokia Siemens Networks produces telecommunications network equipment, solutions and services. Nokia is also engaged in providing free digital map information and navigation services through its wholly-owned subsidiary Navteq. Nokia also has greater dependency on England based company duo namely Symbian Corporation for its mobile operating systems and OVI for its mobile based application software development and distribution, which has made Nokia as highest selling mobile phone vendor within the last few years.