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Telekom Austria keeps the hills alive with the sound of conversation. The country's largest telecommunications provider offers fixed-line telephone and Internet access to more than 2 million individuals and businesses, and cable TV to more than 100,000 homes. With nearly 5 million wireless subscribers, Telekom Austria counts more than half the country's population as customers. The company also has more than 14 million additional wireless subscribers through holdings in seven other companies across central and southeastern Europe, including mobilkom Liechtenstein and VIPnet in Croatia. The Austrian government owns 28% of Telekom Austria; Capital Research & Management, a Capital Group company, follows with 15%.

Telenor dominates the Norwegian telecommunications market with millions of mobile, fixed-line telephone, and Internet accounts. It also offers cable television in Norway and satellite television in Nordic countries through subsidiary Telenor Broadcast. The company serves about 3 million mobile phone users in Norway through Telenor Mobil. Its businesses in Denmark and Sweden each contribute about 2 million subscribers. Outside of the Nordic region, Telenor operates in Eastern Europe (including Russia, Ukraine, and Hungary) and in Asia (primarily Thailand). With about 170 million mobile subscribers overall, through subsidiaries and affiliated companies, Telenor is among the largest global wireless carriers.

Telenor Denmark (formerly SONOFON) is one of the largest mobile telecommunications carriers in Denmark. The company provides wireless voice and data services in addition to fixed-line telephony and Internet access primarily to the enterprise market. The company is a subsidiary of Norway- based global telecommunications carrier Telenor. During 2008 and 2009, Telenor merged and rebranded its operations in Denmark (including SONOFON, Cybercity, and Tele2 Danmark) under the Telenor Denmark banner. The combined business provides cell phone service to about 2 million customers while providing about 200,000 subscribers with broadband Internet service.

Teenagers across the UK may argue it's not oxygen, but rather the other O2 that sustains their lives. Telefonica O2 UK -- a branding choice intended to reflect the essential nature of the company's products -- puts mobile phones and wireless services in the hands of about 22 million individual and business customers in the UK. The company also provides broadband services to about 700,000 subscribers. Through almost 500 retail stores and its O2 Online Shop, the company offers voice, text, media messaging, games, music, video, and data connections for wireless users. The company is a primary operating subsidiary of cell phone giant Telefonica O2 Europe, accounting for almost half of its parent's annual revenues.

One of the top US phone companies without a regional Bell lineage, Telephone and Data Systems (TDS) has more than 7 million local phone and wireless customers in 36 states. The company's core business unit, United States Cellular, serves about 6 million customers in 26 states; key markets are located in the central and mid-Atlantic regions of the US. The company also offers fixed-line and Internet services in rural and suburban markets in several states through its TDS Telecommunications (TDS Telecom) and TDS Metrocom subsidiaries. TDS Telecom provides local service through more than 1 million access lines in 30 states.

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