Nokia also acquired Mobira, a mobile telephony company, which was the foundation of its future mobile phone business. In 1981, Mobira launched the Nordic Mobile Telephone (NMT) service, the world's first international cellular network and the first to allow international roaming. In 1982, Mobira launched the Mobira Senator car phone, Nokia's first mobile phone. At that time, the company had no interest in producing mobile phones, which the executive board regarded as akin to James Bond's gadgets: improbably futuristic and niche devices. After all these acquisitions, Nokia's revenue base became US$2.7 billion. CEO Kairamo committed suicide on 11 December 1988.