This is a list of notable mobile virtual network operators (MVNOs) in the United Kingdom, which lease wireless telephone and data spectrum from the major carriers EE, O2, Three and Vodafone for resale.
The adoption of eSIM (embedded SIM) technology in the United Kingdom has expanded in the 2020s, allowing mobile users to activate cellular service without the need for a physical SIM card. Major network operators, including EE, Vodafone, O2, and Three, have implemented eSIM support across their postpaid plans, with select prepaid options also available. This development aligns with the broader global trend of transitioning towards digital SIM technology. In addition to the major carriers, several mobile virtual network operators (MVNOs), such as giffgaff, Lyca Mobile, Tesco Mobile and easySim offer eSIM services.