Advanced Info Service Public Co., via its subsidiaries, is engaged in the operation of a 900 MHz cellular telephone system, the acting as a service provider of online data communications service via telephone land lineand optical fiber and service provider of call center and service provider of digital mobile phone network; distributor of cash card business; service provider of electronic payment and cash card; service provider of international telephone service/gateway; andservice provider of cellular telephone network in 2.1-GHz and 1800MHz frequency. As of Dec 31 2015, Co. had three segments: mobile phone and call center services; mobile phone sales; and datanet and broadband services.

China Telecom is a full services integrated information service operator and wireline telecommunications and broadband services provider in the People's Republic of China. Co. offers wireline and mobile telecommunications services including wireline voice, mobile voice, internet, managed data and leased line, value-added telecommunications services, integrated information application services and other related services. As of Dec 31 2010, Co. had wireline access lines in service of approximately 175 million, wireline broadband subscribers of approximately 63 million and mobile subscribers of approximately 90 million.