Question:

Can I use my AT&T phone on Virgin Mobile?

Answer:

No, Carriers operating on the GSM network use SIM cards. In the United Sates, this includes AT&T Wireless. Carriers that use the competing CDMA network do not yet use card-enabled phones. These carriers include Sprint PCS, Verizon and Virgin Mobile.

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AT&T Sprint CDMA GSM Verizon

AT&T Mobility branded and referred to as AT&T, formerly Cingular Wireless LLC, is a wholly owned subsidiary of AT&T Inc. that provides wireless services to 109.4 million subscribers in the United States, including Puerto Rico and the U.S. Virgin Islands. AT&T Mobility is the second largest wireless telecommunications provider in the United States and Puerto Rico. AT&T Mobility is headquartered in the Lenox Park area of DeKalb Co. Georgia, just outside Atlanta.

Originally Cingular Wireless LLC from 2000 to 2007, a joint venture between SBC Communications and BellSouth, the company acquired the old AT&T Wireless in 2004; SBC later acquired the original AT&T and re-branded as "AT&T". Cingular became wholly owned by AT&T in December 2006 as a result of AT&T's acquisition of BellSouth.


Virgin Mobile

Virgin Mobile is a wireless communications brand used by eight independent brand-licensees worldwide. Virgin Mobile branded wireless communications services are currently available in Australia, Canada, Chile, Colombia, France, India, Poland, South Africa, the United Kingdom, and the United States. Virgin Mobile branded services were formerly offered in Singapore and Qatar.

Each Virgin Mobile branded entity acts independently from the others, thus the handsets, service plans and network radio interfaces vary from country to country. In a given country, the Virgin Mobile wireless entity is typically a partnership between Richard Branson's Virgin Group and an existing mobile network operator or mobile virtual network operator.


Mobile phone companies

A mobile network operator or MNO (also known as a wireless service provider, wireless carrier, cellular company, or mobile network carrier) is a provider of wireless communications services that owns or controls all the elements necessary to sell and deliver services to an end user including radio spectrum allocation, wireless network infrastructure, back haul infrastructure, billing, customer care and provisioning computer systems and marketing, customer care, provisioning and repair organizations.

In addition to obtaining revenue by offering retail services under its own brand, an MNO may also sell access to network services at wholesale rates to mobile virtual network operators or MVNO's.

Wireless Companies listed on the New York Stock Exchange
Sprint Nextel

Sprint Corporation also known as Sprint, is a United States telecommunications holding company that provides wireless services and is also a major global Internet carrier. It's the third largest U.S. wireless network operator as of 2013, and served more than 54 million customers at the end of the third quarter of 2013, in addition to the Sprint brand, the company also offers wireless voice, messaging, and broadband services through its various subsidiaries under the Boost Mobile, Virgin Mobile, and Assurance Wireless brands, as well as wholesale access to its wireless networks to mobile virtual network operators. The company is headquartered in Overland Park, Kansas. In July 2013, a majority of the company was purchased by Japanese telecommunications company SoftBank Corporation, although the remaining shares of the company continue to trade on the New York Stock Exchange.

Sprint traces its origins to the Brown Telephone Company, which was founded in 1899 to deploy telephone service to the rural area around Abilene, Kansas. In 2006, Sprint exited the local landline telephone business, spinning those assets off into a newly created company named Embarq, which later became a part of CenturyLink. The company continues to be one of the largest long distance providers in the United States.


Virgin Mobile

Virgin Mobile is a wireless communications brand used by eight independent brand-licensees worldwide. Virgin Mobile branded wireless communications services are currently available in Australia, Canada, Chile, Colombia, France, India, Poland, South Africa, the United Kingdom, and the United States. Virgin Mobile branded services were formerly offered in Singapore and Qatar.

Each Virgin Mobile branded entity acts independently from the others, thus the handsets, service plans and network radio interfaces vary from country to country. In a given country, the Virgin Mobile wireless entity is typically a partnership between Richard Branson's Virgin Group and an existing mobile network operator or mobile virtual network operator.


AT&T Mobility

AT&T Mobility branded and referred to as AT&T, formerly Cingular Wireless LLC, is a wholly owned subsidiary of AT&T Inc. that provides wireless services to 109.4 million subscribers in the United States, including Puerto Rico and the U.S. Virgin Islands. AT&T Mobility is the second largest wireless telecommunications provider in the United States and Puerto Rico. AT&T Mobility is headquartered in the Lenox Park area of DeKalb Co. Georgia, just outside Atlanta.

Originally Cingular Wireless LLC from 2000 to 2007, a joint venture between SBC Communications and BellSouth, the company acquired the old AT&T Wireless in 2004; SBC later acquired the original AT&T and re-branded as "AT&T". Cingular became wholly owned by AT&T in December 2006 as a result of AT&T's acquisition of BellSouth.


Verizon Wireless

Cellco Partnership, doing business as Verizon Wireless, is the largest mobile network operator in the United States, providing wireless services to 119.450 million subscribers as of Q3 2013. Headquartered in Basking Ridge, New Jersey, the company was formed as a joint venture of American telecommunications firm Bell Atlantic (renamed Verizon Communications) and global British telecommunications company Vodafone. Verizon Communications holds 55 percent ownership and Vodafone holds the remaining 45 percent of the joint venture. On September 2, 2013, Verizon Communications announced that it had agreed to buy Vodafone's stake for $130 billion in a deal expected to close by the first quarter of 2014. With this deal the company becomes a division of Verizon Communications.

All cellular phone networks worldwide use a portion of the radio frequency spectrum designated as ultra high frequency, or "UHF", for the transmission and reception of their signals. The ultra high frequency band is also shared with television, Wi-Fi and Bluetooth transmission. The cellular frequencies are the sets of frequency ranges within the ultra high frequency band that have been allocated for cellular phone use.

For historical reasons, radio frequencies used for cellular networks differ in the Americas, Europe, Africa and Asia. The first commercial standard for mobile connection in the United States was AMPS, which was in the 800 MHz frequency band. In Nordic countries of Europe, the first widespread automatic mobile network was based on the NMT-450 standard, which was in the 450 MHz band. As mobile phones became more popular and affordable, mobile providers encountered a problem because they couldn't provide service to the increasing number of customers. They had to develop their existing networks and eventually introduce new standards, often based on other frequencies. Some European countries (and Japan) adopted TACS operating in 900 MHz. The GSM standard, which appeared in Europe to replace NMT-450 and other standards, initially used the 900 MHz band too. As demand grew, carriers acquired licenses in the 1,800 MHz band. (Generally speaking, lower frequencies allow carriers to provide coverage over a larger area, while higher frequencies allow carriers to provide service to more customers in a smaller area.)


Mobile virtual network operators

A Mobile Virtual Network Operator (MVNO) (or mobile other licensed operator (MOLO) in the United Kingdom) is a wireless communications services provider that does not own the wireless network infrastructure over which the MVNO provides services to its customers. An MVNO enters into a business agreement with a mobile network operator to obtain bulk access to network services at wholesale rates, then sets retail prices independently. An MVNO may use its own customer service and billing support systems, marketing and sales personnel or it may employ the services of a Mobile Virtual Network Enabler (MVNE).

Countries such as the United Kingdom, Scandinavian countries, and Spain are leading this business model in Europe.

Technology
Electronic engineering

Electronics engineering, or electronic engineering, is an engineering discipline where non-linear and active electrical components such as electron tubes, and semiconductor devices, especially transistors, diodes and integrated circuits, are utilized to design electronic circuits, devices and systems, typically also including passive electrical components and based on printed circuit boards. The term denotes a broad engineering field that covers important subfields such as analog electronics, digital electronics, consumer electronics, embedded systems and power electronics. Electronics engineering deals with implementation of applications, principles and algorithms developed within many related fields, for example solid-state physics, radio engineering, telecommunications, control systems, signal processing, systems engineering, computer engineering, instrumentation engineering, electric power control, robotics, and many others.]verification needed[

The Institute of Electrical and Electronics Engineers (IEEE) is one of the most important and influential organizations for electronics engineers.

Technology Internet
Technology Internet

The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (TCP/IP) to serve several billion users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless and optical networking technologies. The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents of the World Wide Web (WWW), the infrastructure to support email, and peer-to-peer networks.

Most traditional communications media including telephone, music, film, and television are being reshaped or redefined by the Internet, giving birth to new services such as voice over Internet Protocol (VoIP) and Internet Protocol television (IPTV). Newspaper, book and other print publishing are adapting to website technology, or are reshaped into blogging and web feeds. The Internet has enabled and accelerated new forms of human interactions through instant messaging, Internet forums, and social networking. Online shopping has boomed both for major retail outlets and small artisans and traders. Business-to-business and financial services on the Internet affect supply chains across entire industries.

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