Advanced Info Service

Advanced Info Service, also known as AIS, a publicly owned company headquartered in Thailand, was founded in 1986 and operates primarily in telecoms with approximately 2,920 employees. The company reported $6.9B in revenue as of 2025. Functioning as Thailand's largest GSM mobile phone operator with 39.87 million customers as of Q3 2016, Advanced Info Service initially started as a computer rental business. In October 1990, it launched analog 900 MHz mobile phone services under a 20-year monopoly concession from the Telephone Organization of Thailand (TOT). The company later became the first allowed to operate on the GSM-900 frequency and acquired Shinawatra Paging in June 1992.