Airport SIM & eSIM Prices

EE has the widest network coverage in the UK, useful if your trip goes beyond central London. A 30-day SIM with a large data bundle costs around £20; no ID is required to buy or activate a prepaid SIM in the UK, unlike much of continental Europe.

Usually the best value large-data plan, often with free roaming in dozens of destinations under Three's 'Go Roam' feature, useful if the UK is one stop on a wider European trip. Coverage is a step behind EE and Vodafone outside big cities.

Strong network reliability in and around London, with plans typically activated online in minutes using an app rather than requiring a shop visit. EU roaming allowances tend to be smaller than the UK data bundle, so check before relying on it elsewhere in Europe.

A budget SIM-only brand running on O2's network, known for cheap 'Goodybag' data bundles and a famously helpful community support forum instead of call centres. Best arranged before the trip since the free SIM takes a few days to arrive by post.

The same prepaid data bundle issued as a digital eSIM, so a home number stays active on the other line — handy since, unlike much of Europe, no ID or passport is needed to activate a UK prepaid SIM or eSIM.