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The GSM (Global System for Mobile Communications) standard was developed by the European Telecommunications Standards Institute (ETSI) in the late 1980s. While there isn't a single inventor of the GSM mobile phone, key figures involved in its development include Jean-Claude Guedon, who played a significant role in its standardization, and companies like Ericsson, Nokia, and Siemens, which contributed to the technology's implementation. The first GSM network was launched in 1991 in Finland.

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