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Advanced Info Service Public Company Limited, together its subsidiaries, provides communication products and services primarily in Thailand. It is involved in the operation of cellular telephone networks, networks, and telecommunication and internet services. The company also distributes handsets; cash cards and electronic payment services; and internet equipment. In addition, it provides international telephone, broadcasting network, and television broadcasting services for various channels; and digital platform, as well as insurance brokerage services. Further, the company offers IT system service development, content aggregator, and billing and collection outsourcing services; call center services; and space, and land and building services, as well as related facilities. Additionally, it provides internet data center, and internet and satellite uplink-downlink services for communications; mobile contents, application development, and digital marketing services; fixed-line services and data communication network services; software development services; online domain names; services of infrastructure development of fibre optic networks; and training and online advertising services. The company is involved in resale of mobile phone, voice over internet phone, and leased circuit services. Advanced Info Service Public Company Limited was founded in 1986 and is headquartered in Bangkok, Thailand.

BT Group plc provides communications services worldwide. Its Consumer segment sells telephones, baby monitors, and Wi-Fi extenders through high street retailers, online BT Shop, and Website BT.com; and offers home phone, copper and fiber broadband, TV, and mobile services in various packages. The company's EE segment offers 2G, 3G, and 4G mobile network services; broadband, fixed-voice, and TV services; and postpaid and prepaid plans, and emergency services network. This segment also sells 4G mobile phones, tablets, connected devices, and mobile broadband devices from various manufacturers. Its Business and Public Sector segment provides fixed voice, mobility, fiber and connectivity, and networked IT services to retailers, utilities, public sector, healthcare, sports, construction, finance, and educational sectors. The company's Global Services segment offers business communications and ICT services comprising BT Connect, BT Security, BT One, BT Contact, BT Compute, BT Advise, and BT for financial markets. This segment serves approximately 5,500 customers in 180 countries. Its Wholesale and Ventures segment enables communications providers and other organizations to provide fixed or mobile phone services. Its ventures provide mass-market services, such as directory enquiries and payphones; and enterprise services comprising BT Fleet and BT Redcare. This segment also provides broadband and Ethernet, voice, hosted communication, mobile virtual network operator, managed solutions, machine-to-machine, roaming, and media services. The company's Openreach segment engages in the provision of services over the local access network; and installation and maintenance of fiber and copper communications networks that connect homes and businesses. The company was formerly known as Newgate Telecommunications Limited and changed its name to BT Group plc in September 2001. BT Group plc was incorporated in 2001 and is headquartered in London, the United Kingdom.

Swisscom AG provides telecommunication services primarily in Switzerland, Italy, and internationally. It operates through three segments: Swisscom Switzerland, Fastweb, and Other Operating. The company offers mobile and fixed-network services, such as telephony, TV, broadband, and mobile offerings, as well as sells terminal equipment; and telecom and communications solutions for large corporations and small and medium-sized enterprises. It also provides cloud, outsourcing, workplace, mobile phone, networking, business process optimization, SAP, and security and authentication solutions, as well as a range of services to the banking industry; Internet of Things solutions; digitization services to the healthcare sector; IT systems for health insurance companies; fixed-line and mobile networks by other telecommunication service providers; and roaming to foreign operators whose customers use its mobile networks, as well as broadband services and regulated products. In addition, the company plans, operates, and maintains network infrastructure and IT systems; provides support functions to finance, human resource, and strategy, as well as management of real estate and vehicle fleet; and offers broadband and mobile services, such as telephony, mobile offerings, and broadband services, as well as ICT solutions for residential, business, and wholesale customers. Further, it provides IT and network services; online and telephone directories; and cross-platform retail media and security communication services, as well as builds and maintains wired and wireless networks. The company was founded in 1998 and is based in Bern, Switzerland.

Telia Company AB (publ) provides communication services to businesses, individuals, families, and communities in Sweden, Finland, Norway, Denmark, Lithuania, Estonia, and Latvia. It offers mobile, broadband, television, and fixed-line services; and networking, cloud and security, mobility, enterprise mobile network, contact center, managed mobility services, collaboration solutions, enterprise telephony, Internet of Things (IoT), carrier ethernet, dedicated internet access, wavelengths, IP Transit, dark fiber, and colocation solutions. The company also provides IoT connectivity, building monitoring, smart public transport, and smart utilities, as well as transport and logistics solutions comprising connected vehicle, asset tracking, and fleet management services. It markets its products and services under the Telia, Telia Cygate, TV4, C More, Halebop, Fello, MTV, Phonero, Onecall, MyCall, CallMe, MIT Tele, Ezys, Diil, Super, and Imt brand names for transport and logistics, public transport, manufacturing, retail, utilities, buildings and real estate, and public sector industries. The company was formerly known as TeliaSonera AB (publ) and changed its name to Telia Company AB (publ) in April 2016. Telia Company AB (publ) was founded in 1853 and is based in Solna, Sweden.

Telefônica Brasil S.A., together with its subsidiaries, operates as a mobile telecommunications company in Brazil. Its fixed line services portfolio includes local, domestic long-distance, and international long-distance calls; and mobile portfolio comprises voice and broadband internet access through 3G, 4G, 4.5G, and 5G, as well as mobile value-added and wireless roaming services. The company also offers data services, including broadband and mobile data services. In addition, it provides pay TV services through IPTV technologies; network services, such as rental of facilities; other services comprising internet access, private network connectivity, computer equipment leasing, extended service, caller identification, voice mail, cellular blocker, and others; wholesale services, including interconnection services to users of other network providers; and digital services, such as entertainment, cloud, and security and financial services. Further, the company offers multimedia communication services, which include audio, data, voice and other sounds, images, texts, and other information, as well as sells devices, such as smartphones, broadband USB modems, and other devices. Additionally, it provides telecommunications solutions and IT support to various industries, such as retail, manufacturing, services, financial institutions, government, etc. It markets and sells its solutions through own stores, dealers, retail and distribution channels, door-to-door sales, and outbound tele sales. The company was formerly known as Telecomunicações de São Paulo S.A. - TELESP and changed its name to Telefônica Brasil S.A. in October 2011. The company was incorporated in 1998 and is headquartered in São Paulo, Brazil.