Tesco Mobile is a mobile virtual network operator (MVNO) in the United Kingdom, the Republic of Ireland and Slovakia. It is operated by Tesco, using the O₂ network as its carrier.

Tesco Mobile is run on the O₂ network in the UK and Ireland. As such, the virtual operator is able to offer comprehensive coverage of the UK population without having to invest in infrastructure. The company focuses on value for money deals but, in practice, offers tariffs comparable with other operators, particularly rival virtual operator Virgin Mobile based on the T-Mobile and Orange 2G and 3G network.

Tesco mobile has 3 million customers (as of 18 April 2012).

On 19 December 2006, Tesco Ireland announced that it would enter into a joint venture with O₂ Ireland to offer mobile telecommunications services. The service, which is Ireland's second MVNO (the defunct Cellular 3 having been the first), uses the O₂ network but operates separately. It has been allocated the STD code 089. As with Tesco's UK mobile service, it has been branded Tesco Mobile. The network commenced operation in 2007.

Coordinates: 51°42′18.89″N 0°1′36.37″W / 51.7052472°N 0.0267694°W / 51.7052472; -0.0267694

Tesco plc (LSE: TSCO) is a British multinational grocery and general merchandise retailer headquartered in Cheshunt, United Kingdom. It is the third-largest retailer in the world measured by revenues (after Wal-Mart and Carrefour) and the second-largest measured by profits (after Wal-Mart). It has stores in 14 countries across Asia, Europe and North America and is the grocery market leader in the UK (where it has a market share of around 30%), Malaysia, the Republic of Ireland and Thailand.

The company was founded in 1919 by Jack Cohen as a group of market stalls. The Tesco name first appeared in 1924, after Cohen purchased a shipment of tea from T. E. Stockwell and combined those initials with the first two letters of his surname, and the first Tesco store opened in 1929 in Burnt Oak, Middlesex. His business expanded rapidly, and by 1939 he had over 100 Tesco stores across the country. Originally a UK-focused grocery retailer, since the early 1990s Tesco has increasingly diversified geographically and into areas such as the retailing of books, clothing, electronics, furniture, petrol and software; financial services; telecoms and internet services; DVD rental; and music downloads.