The company has operated in various industries over the past 150 years. It was founded as a pulp mill and had long been associated with rubber and cables, but since the 1990s has focused on large-scale telecommunications infrastructure, technology development, and licensing. Nokia is a major contributor to the mobile telephony industry, having assisted in the development of the GSM, 3G, and LTE standards (and currently in 5G), and was once the largest worldwide vendor of mobile phones and smartphones. After a partnership with Microsoft and Nokia's subsequent market struggles, Microsoft bought its mobile phone business, creating Microsoft Mobile as its successor in 2014. After the sale, Nokia began to focus more on its telecommunications infrastructure business and on Internet of things technologies, marked by the divestiture of its Here mapping division and the acquisition of Alcatel-Lucent, including its Bell Labs research organization. The company then also experimented with virtual reality and digital health, the latter through the purchase of Withings. The Nokia brand returned to the mobile and smartphone market in 2016 through a licensing arrangement with HMD Global. Nokia continues to be a major patent licensor for most large mobile phone vendors. As of 2018, Nokia is the world's third-largest network equipment manufacturer.