High Quality Content by WIKIPEDIA articles! Nokia Siemens Networks B.V. is a multinational data networking and telecommunications equipment company headquartered in Espoo, Finland and a joint venture between Nokia of Finland and Siemens of Germany. It is the world`s fourth-largest telecoms equipment manufacturer measured by 2011 revenues (after Ericsson, Huawei and Alcatel-Lucent). Nokia Siemens Networks has operations in around 150 countries.