Better known as O2 Ireland, Telefonica O2 Ireland provides cell phone service, to about 1.6 million consumer and business customers on the Emerald Isle. In addition to voice and data messaging services, which are provided primarily on a prepaid basis, O2 Ireland also offers wireless broadband Internet services under the O2 Broadband banner. The company's other operations include a joint sales venture, known as Tesco Mobile, with UK supermarket giant Tesco. O2 Ireland, a subsidiary of Spain-based Telefonica, operates from facilities in Dublin, Cork, Galway, and Limerick.

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.

Call Kabul thanks to Telephone Systems International (TSI). The company provides phone and Internet services in Afghanistan. Founded in 1998 by CEO, Afghan emigre Ehsan Bayat, TSI has been involved in efforts to rebuild the Afghani infrastructure and bring telecom services to the country. The company operates in Afghanistan through a joint venture with the Afghan government known as Afghan Wireless Communications Company (AWCC); the Afghan state owns 20% of the business which was founded in 1999 and began offering wireless and Internet communications services in 2002. AWCC has sales and administrative offices in several major cities across the country including Kabul, Jalalabad, and Kandahar.

Teleste is an international technology group founded in 1954, which is specialised in broadband video and data communication systems and services. The group is active in two business segments, Video and Broadband Solutions and Network Services; in both fields, the company is among the global leaders. Video is at the core of the company business activities, with a focus on the processing, transmission and management of video and data for operators and public authorities who provide multiple video-related information, entertainment and security services to end-users. Video and Broadband Solutions business segment has the emphasis on product solutions for broadband access networks, video service platforms and video surveillance applications. Network Services segment deliver comprehensive network service solutions including new construction, rebuilding, upgrading, planning and maintenance services of cable networks. In 2009 the group's net sales totalled EUR 142 million and the group employed 1260 persons at the year-end. The company has approximately 30 offices world-wide and over 90% of Teleste's net sales are generated outside Finland. The company is listed on the NASDAQ OMX Helsinki Ltd.

Even the stars can benefit from Telestial when they travel abroad. The company offers pre-paid wireless telecommunications products and services to businesses in North America and recreational travelers. Partnering with local carriers around the globe, Telestial offers telecom services for use in over 140 countries, including international long-distance and mobile wireless service utilizing GSM (global services for mobile communications) networks.

Teletouch Communications has its own idea of what it means to "reach out and touch someone." Through its Progressive Concepts, Inc. (PCI) subsidiary, the company resells mobile voice and data services provided by AT&T Mobility to customers in Texas; it has nearly 80,000 consumer and commercial subscribers on its books. PCI also distributes cell phones, two-way radios, accessories, and car audio and security products through its nearly 20 Hawk Electronics retail locations. Suppliers include Motorola, Kenwood, and Vertex. The bulk of its stores are located in the Dallas/Fort Worth area, but it also has two locations in San Antonio. Chairman Robert McMurrey owns a controlling stake in the company.

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