Best eSIM for the United Kingdom

Prices in the United Kingdom

A travel eSIM buys convenience here, not value; the local SIMs below carry four to eight times the data at the price. How the three providers compare across all fifteen destinations is in our main eSIM comparison.

Which network you get

EE is the network behind Airalo; Holafly lists all the UK networks:

• Airalo shows EE as its network. No 5G or hotspot statement. Its page says the eSIM covers England, Scotland, Wales and Northern Ireland but not Jersey, Guernsey or the Isle of Man.
• Holafly lists Orange UK, T-Mobile UK, Three, Virgin Media O2 and Vodafone under “Networks” without saying which it uses, with 5G where available and hotspot sharing capped at 1 GB a day.
• Saily does not name its network; it states 5G depending on the local provider and unrestricted hotspot use.

Buying a local SIM instead

Pay-as-you-go SIMs are free or near-free, sold online, in shops and at the airport.

• Three Pay As You Go data packs: 40 GB for £10, 100 GB for £15 or unlimited for £35 a month in shops, with larger online-only packs (60 GB for £10, 120 GB for £13.50); all include 5G and unlimited calls and texts.
• O2 Pay As You Go Big Bundles: 8 GB for £10, 25 GB for £15, 40 GB for £20, with a free SIM ordered online or in store. O2’s shop page says 5G is available on all pay-as-you-go plans, while its bundle terms exclude 5G from the data allowance; ask before relying on it.
• EE pay-as-you-go packs run 30 days with “no contracts, no credit checks”; Vodafone lists a £10 pay-as-you-go plan with 21 GB.
• Heathrow’s own site lists Sim Local with 11 shops across Terminals 2, 3, 4 and 5, mostly in arrivals and generally open 06:00 to 22:00, selling SIMs from the main operators, and a free eSIM offer.
• No operator page mentions ID for a pay-as-you-go SIM, and we found no regulator page either way, so we say only that the operators ask for none.

Before you land

Land on the eSIM if you want data at the gate; switch to a £10 SIM for anything longer than a weekend.

• Install on Wi-Fi at home; Airalo allows 365 days from purchase to start, Saily 180.
• These are data-only plans. Keep your home SIM active for the text messages your bank and your airline send, with data roaming switched off on it.
• Carry your onward reservation in a form that opens without a connection: the check-in desk asks for it before the eSIM is on. The United Kingdom’s onward-ticket rules are on their own page, and the free checker covers your passport.