Yoigo Logo – Telstra (formerly Xfera ) is the trade name under which it operates Xfera Móviles SA , the fourth largest wireless digital in Spain. Telstra has licensed the technology network to GSM / 2G and UMTS / 3G, and an agreement of roaming to use national GSM and UMTS Movistar .

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Although commercial release occurred in December 2006, the company was founded in 2000 and was in principle a whooping historia. Yoigo closed the year 2011 with 3,039,000 customers.

Its main competitors are the other three companies with network, Movistar, Vodafone,Orange and between MVNOs Másmovil ,Simyo , Pepephone, Carrefour Mobile and Mobile Eroski.

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Before unification, some companies used the technology CDMA , but in 2007, Vivid has adapted the technology GSM , which has already been implemented in all states of Brazil, and Mexico City, becoming the sole operator who works with technology CDMA , TDMA and GSM in Brazil.

The price of maintaining the technology CDMA is very expensive, so this technology is second in the preference by customers. Although this fact is also due to the growth of GSM in Brazil, which gradually, increasingly, is the technology used by most Brazilians. Some areas already covered CDMA2000 (1xRTT), which is two times faster than the technology GPRS GSM phone.

Live began in July 2005 the sale of mobile 3G , using technology CDMA 1 x EV-DO . This is the first implementation of technology 3G in Brazil. EVDO coverage is present in the following states of Brazil: Bahia ( Salvador , Camaçari and A ) in the Federal District ( Brasilia ), Espírito Santo ( Victória ), Paraná ( Curitiba , São José dos Pinhais and Araucaria ), Rio de Janeiro ( Rio de Janeiro , Niterói , Campos dos Goytacazes , Macae , Rio das Oysters and Armacao dos Búzios ), Rio Grande do Sul ( Porto Alegre ), Santa Catarina ( Florianópolis ), São Paulo ( São Paulo ,Campinas , São Bernardo do Campo ,Osasco , São José dos Campos ,Barueri , São Caetano do Sul , Campos Jordao ,Sertãozinho , Ribeirão Preto and Franca ). The expansion of this coverage was interrupted with the network RTT x 1.

The adoption of the technology CDMA also caused difficulties in digital mobile customers CDMA Vivo in the region of Minas Gerais (technology CDMA coverage is available only in the region covered by CTBC Celular , ie, northeastern Brazil, except Bahia , Maranhão and Sergipe -). Another important problem is the high level of cloning technology live analog, AMPS andCDMA , which does not happen with GSM technology. However, the technology AMPS is being shut down, for determination of Anatel (National Telecommunications Agency), until it is fully disabled on all operators in the future. Is expected to live longer operate with CDMA in 2011. The remaining spectrum of AMPS , will be used as an extension of frequency in WCDMA / HSPA and used to expand the capacity of the 2.5G network technology GSM and CDMA .

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VeriSign is a company that provides infrastructure services for telecommunications networks, including Internet. Its main activity in terms of turnover is the signature of certificates: Verisign allows users to identify interlocutors, thus limiting the possibilities of attacks such as “Attack of the middle man.

In addition, VeriSign manages the databases that determine the interpretation of Internet addresses of the domains .com and .net . That is to say that when you are trying to reach www.example.com server Verisign will be more or less directly contacted to identify the IP address of the server you need to contact. In 2003, VeriSign has set up a controversial one that uses this unique position.

Verisign managed the .org until 2003 but abandoned it to continue to manage .com is the largest area. In 2011, his contract to manage. net was automatically renewed for 6 years. In April 2012, VeriSign has partnered with Symantec to create Norton™ brand Secured. This logo will help give users some assurance of safety and reliability of websites consulted.

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verisign

Verizon Communications, Inc. is a leading broadband and telecommunications American, also part of the Dow Jones Index. It was founded in 2000, following the acquisition by Bell of GTE. Its name is an acronym of veritas and horizon.

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Verizon was founded as Bell Atlantic Corporation by AT&T Corporation as one of the seven Baby Bells that were formed after the antitrust lawsuits against AT&T. Originally operating in the states of New Jersey, Pennsylvania, Delaware, Maryland, West Virginia and Virginia, and Washington, DC in the United States.

On June 30, 2000 Bell Atlantic acquired GTE and changed its name to Verizon Communications Inc. It was one of the largest mergers in the history of U.S. business. The company was worth over 52 billion dollars.
Verizon currently has more than 140 million subscribers. After merging with MCI has more than 250 000 employees.

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verizon

U.S. Cellular Logo – The United States Cellular Corporation , or just U.S. Cellular is a U.S. mobile phone companies. With 6.1 million customers, it is in the U.S. mobile market in terms of subscribers behind the sixth-largest competitor, the competitor Verizon Wireless , AT & T Mobility , Sprint Nextel , T-Mobile and MetroPCS (in 2009).

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U.S. Cellular currently operates a CDMA2000 cellular network in 126 local markets in 26 U.S. states, the geographic focus primarily in the Northwest, Midwest and is located in the northeastern United States. About roaming agreements with other network operators are the services offered to customers throughout the U.S. and internationally.

Since its founding in 1983, the Company operated an AMPS cellular network. Until 2002, when the transition was initiated on the CDMA technology, the growing number of customers (including through acquisition of smaller local mobile network operators) to 4 million. From 2009 the upgrade of CDMA network with EV-DO standard, which allows faster data transfers. The introduction of LTE service is planned for late 2011.

The company is owned 83% of the Consolidated Telephone and Data Systems . The operation in the 90’s, when the U.S. mobile market was highly fragmented, under the name “Aerial Communications” and a GSM network, which ultimately, however, to was VoiceStream (the predecessor company of T-Mobile USA) was sold.

Several market surveys U.S. Cellular as a mobile operator with the highest customer satisfaction and call quality is referred to in the U.S.. On the product side tries to highlight the company and thus by incoming connections are not (as in the U.S. is usual) the customer’s account be made.

Telefonica Logo – Telefónica SA (IBEX 35: TEF, Madrid Stock Exchange Ticker: TEF) is an operating company of telecommunications services (fixed telephony, mobile telephony and ADSL) multinational with headquarters in Madrid, Spain, and as of July 2010 is the fifth telecommunications company in size and importance in the world.

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Telefónica is one of the leading integrated telecommunications operators worldwide in providing solutions for communication, information and entertainment, with presence in Europe, Africa, Latin America and since 2010 in Asia. In Spain, public retail distributes its products through various subsidiaries and several trade names: The fixed telephony under the brand before Telefónica, the mobile phone through Telefónica Móviles subsidiary under the Movistar brand. From May 1, 2010, the company changed in Spain the name of your trademark by Movistar Telefonica, which until then had been only the trademark of Telefónica Móviles, beginning to distribute all its products under the brand name and adding by service for the suffixes “Movistar Fixed”, “Movistar Mobile”, “Movistar Imagenio” etc.. However, the legal names of companies and their subsidiaries remain the same.

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TeliaSonera Logo – TeliaSonera is the dominant mobile operator in Sweden and Finland. It also operates in other countries such as Norway, Denmark, Estonia, Latvia, Spain, Russia and Turkey, with a total of 150 million users (2010). Its headquarters is located in Stockholm. TeliaSonera is a corporation incorporated under the laws of Sweden.

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TeliaSonera is the result of the merger of Telia and Sonera. The merger took place in December 2002 and brought together two of the leading telecommunications companies in the Nordic region (Sweden-Finland in particular). Formed a leading telecommunications group in the Nordic and Baltic regions, with strong market positions even in Eurasia, Russia and Turkey.

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Telenor Logo – Telenor is a company phone Norwegian listed on the OBX Index of the Oslo Stock Exchange. The company was founded in 1855 as Telegrafverket, changed its name in 1969 to “Televerket” and was renamed again in 1994 under its current name when it was restructured as a public company. Telenor was until 1998 the monopoly of communication services for private customers in Norway. Since December traded.

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Telenor employs 23,400 workers, 12,400 of them outside Norway. In 2006 the market value of the company amounted to 125 billion Norwegian kroner (approx. 17.4 billion euros). The first telephone services offered in Norway in 1996. The Nordic NMT was introduced in 1981, 1993 n diginal system GSM. Since 2004 the network is also available UMTS for commercial use.

On October 31 of 2005 Telenor purchased Vodafone Sverige AB, the Swedish subsidiary of the competitor Vodafone. On April 20 of 2006 also renamed the Telenor network in Sweden. Telenor is, with 74.5 million customers one of the largest mobile operators worldwide.

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telenor

Telecom Italia Logo – Telecom Italia is a private Italian of telecommunications that has inherited the fixed telephone network of the former public operator of the same name. Telecom Italia was born from the merger in July 1994 of the latter with the company Olivetti. This operation, launched by the Managing Director of Olivetti at the time, Roberto Colaninno marked the Italian world of finance and business. It is indeed a takeover daring which enabled it to take control of a much larger group, which saw OPA also realize the privatization of Telecom Italia SpA and Olivetti simultaneously converting from its traditional in materials and services to telecommunications.

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Telecom Italia was founded formally in 1994, by Act of June 30 the board of the public group IRI approving the “Plan for restructuring of telecommunications “under the provisions adopted by the law of 29 January 1992. This restructuring involved the merger of five group companies IRI – STET operating in the telephony sector: Società Piemontese Idroelettrica (SIP), Iritel, Italcable, Telespazio and SIRM. This fusion was born Telecom Italia.

The company was privatized in 1999 through the sale of 97% stake in the company Olivetti of Roberto Colaninno. Since July 2001, it became property of the company Olimpia, cofiliale 50/50 Pirelli and Benetton. In December 2008, Free buys French subsidiary of Telecom Italia ( Alice ADSL among others). On 6 July 2011, Disney and Telecom Italia are launching a catalog of video on demand on the platform of IPTV Cubovision. In March 2012, the Milan prosecutors opened an investigation into the operator as part of a scam to SIM.

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Tele2 Logo – Tele2 is a multinational company Swedish telecommunications founded in 1993 by Jan Stenbeck, and operates in most of Europe. Traded in Stockholm since 1996. Services include fixed and mobile telephony, data network and the Internet, cable TV and content services. The Tele2 Group won last year, revenues of 5.316 million euros and a profit of 702.51 million euros.

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It has about 30 million customers, is present in 14 countries directly, and in 10 countries as a trademark, with another company who has the property of the company but uses the trademark Tele2. Owner operates in Sweden, Norway, Croatia, Estonia, Latvia, Lithuania, Russia, Germany, Austria, Netherlands, Serbia and Bosnia-Herzegovina. Offers ISP services, television and fixed and mobile telephony.

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