Asda Mobile is a UK-based Mobile Virtual Network Operator (MVNO) operating on the Vodafone network, offering flexible, no-contract, and no-credit-check SIM-only plans, including 4G/5G, and 46-country EU roaming. It provides low-cost monthly bundles (from £4/month), pay-as-you-go options, and refurbished phones, with management via the My Account app.