Advanced Info Service Public Company Limited, together its subsidiaries, provides mobile network, fixed broadband, and digital services primarily in Thailand. The company operates through three segments: Mobile Phone Services, Mobile Phone and Equipment Sales, and Datanet and Broadband Services. It is involved in the operation of cellular telephone networks in the frequency of 700 MHz, 900 MHz, 1800 MHz, 2100 MHz, and 2600 MHz frequencies.

The company also imports and distributes handsets and accessories, as well as distributes cash cards; and provides online data communications services through telephone landlines and optical fiber, as well as electronic payment services. In addition, it provides international telephone service, broadcasting network, and television broadcasting services for various channels, as well as insurance brokerage services. Further, the company offers IT system, content aggregator, and billing and collection outsourcing services; call center services; and land and building rental services, as well as related facilities.

Additionally, it provides internet data center, and internet and satellite uplink-downlink services for communications; and distributes internet equipment; publishes business telephone directories and advertising; offers mobile contents; and provides online advertising services.