A SIM card is an integrated circuit (IC) intended to securely store the international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices. Technically the actual physical card is known as a universal integrated circuit card (UICC); this smart card is usually made of PVC with embedded contacts and semiconductors, with the SIM as its primary component. In practise the term "SIM card" refers to the entire unit and not simply the IC.
China Mobile is the trade name of both China Mobile Limited and its ultimate controlling shareholder, China Mobile Communications Group Co., Ltd., a Chinese state-owned company. China Mobile Limited provides mobile voice and multimedia services through its nationwide mobile telecommunications network across mainland China and Hong Kong. China Mobile is the largest wireless carrier in China, with 945.50 million subscribers as of June 2021.
A mobile virtual network operator (MVNO) is a wireless communications services provider that does not own the wireless network infrastructure over which it 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, billing support systems, marketing, and sales personnel, or it could employ the services of a mobile virtual network enabler (MVNE).
Virgin Mobile is a wireless communications brand used by seven independent brand-licensees worldwide. Virgin Mobile branded wireless communications services are available in the United Kingdom, Ireland, Canada, Colombia, Chile, Kuwait, Saudi Arabia, United Arab Emirates, Poland, South Africa, and Mexico. Virgin Mobile branded services used to be offered in Australia, France, Singapore, India, Qatar and the United States.
Virgin Mobile USA was a no-contract Mobile Virtual Network Operator. It used Sprint's network for coverage. It licensed the Virgin Mobile brand from United Kingdom-based Virgin Group. Virgin Mobile USA was headquartered in Kansas City, Missouri, and provided service to approximately 6 million customers.
Truphone is a GSMA accredited global mobile network that operates its service internationally. The company is headquartered in London and has offices in ten other countries, being spread across four continents.
Tesco Mobile Limited is a mobile virtual network operator (MVNO) in the United Kingdom, Ireland, Slovakia, and the Czech Republic. It is operated by British retailer Tesco, using the network O2 as its carrier except in Ireland, where the network operator is Three Ireland.
Asda Mobile is a mobile virtual network operator (MVNO) in the United Kingdom operated by Asda and using the Vodafone network. Asda Mobile previously used the EE network before reverting to Vodafone in 2021. Asda Mobile is available in over 360 stores across the UK and online through purchasing either a SIM card or through an Asda Mobile handset.
TalkTalk Telecom Group plc is a company that provides pay television and Internet access services to businesses and consumers in the United Kingdom. It was founded in 2003 as a subsidiary of Carphone Warehouse and was demerged as a standalone company in March 2010. Its headquarters are in Salford.
Transatel is a telecom corporation headquartered in Paris, La Défense, and led by the founders Jacques Bonifay (CEO) and Bertrand Salomon. NTT Communications took a majority stake in the company on 28 February 2019, transferred to NTT Ltd. on 1 July 2019.
BT Consumer is the main retail division of United Kingdom telecommunications company BT Group that provides fixed-line, mobile, broadband and digital television to consumers in the UK. It buys access to some of these services from BT's other divisions: Openreach and EE. It is the largest consumer fixed-line and broadband ISP in the UK.
Talkmobile is a mobile virtual network operator (MVNO) operating in the United Kingdom on the Vodafone network. As a brand of Vodafone, the business is based in Newbury, Berkshire.
Lycamobile is a British mobile virtual network operator (MVNO) operating in 60 countries. The brand is active in Australia, Austria, Belgium, Denmark, France, Germany, Ireland, Italy, the Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Russia, South Africa, Spain, Sweden, Switzerland, Tunisia, Uganda, Ukraine, the United Kingdom and the United States. The bulk of Lycamobile revenue is claimed to be generated from its SIM products. Lycatel, also a part of Lyca Group, targets customers within expatriate and ethnic markets that want to make international calls.
Globalcell Mobile was a mobile virtual network operator (MVNO) was based in the UK and was established in late 2008.
Jeotex, Inc., known as Datawind, Inc until 2019. and founded in Montreal, Quebec, Canada, is a developer and manufacturer of low-cost tablet computers and smartphones. Datawind manufactures low cost tablets and sells these primarily in India, Nigeria, the United Kingdom, Canada, and the United States. The company is known for its development of the Aakash tablet computer, which is the “world's cheapest tablet” at US$37.99/unit. The Aakash tablet was developed for India's Ministry for Human Resource Development (MHRD).
Mobile by Sainsbury's was a mobile virtual network operator (MVNO) in the UK, operated by Sainsbury's between July 2013 and January 2016, using the Vodafone UK network.
RacoWireless is a provider of wireless products and services focusing on the machine to machine (M2M) industry. The company delivers wireless data and provides a platform for companies to build and support wireless M2M applications.
Hutchison 3G UK Ltd is a British telecommunications and internet service provider currently based in Reading, England. It is a subsidiary of CK Hutchison Holdings, operating under the global Three brand. Three is the fourth-largest mobile network operator in the United Kingdom, with about 9.5 million subscribers as of 2021.
Ultra Mobile is an American Mobile Virtual Network Operator (MVNO), founded in 2011, which sells low-cost prepaid mobile phone services with unlimited international calling and text plans, operating on T-Mobile's cellular network in the United States.
