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Advanced Info Service PCL is Thailand's largest GSM mobile phone operator with 31 million customers as of September 2011. In October 1990, it launched analog 900 MHz mobile phone services with a 20 year monopoly concession from the Telephone Organization of Thailand, and later became the first company allowed to operate on the GSM 900 frequency. Followed by acquiring Shinawatra Paging in June 1992. - Source: Wikipedia

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