Best eSIM for United Kingdom 2026: 5 Providers Priced
United Kingdom eSIM prices checked 27 Oct 2026: ONE eSIM is cheapest at every size from 1 to 20 GB, from $1.57 for 1 GB.
Short answer: ONE eSIM has the cheapest 1 GB eSIM for United Kingdom at $1.57 for 7 days; the next cheapest is Saily at $3.99. Prices checked 27 October 2026 across ONE eSIM, Airalo, Holafly, Saily and Nomad; the full table is below.
Visiting the United Kingdom? You need working mobile data as soon as you land, for maps, messages and sharing photos, without hunting for a local SIM shop or paying home-network roaming rates. An eSIM installs before you fly and activates on arrival, giving you local data without a physical card swap. On 27 October 2026 we compared eSIM prices for the United Kingdom across ONE eSIM, Airalo, Holafly, Saily and Nomad, matching plans by data amount and validity. Unlike most of the other countries here, the UK's second local partner, 3, is listed as 4G only, so EE is the one to rely on for 5G speeds.
Quick answer: United Kingdom eSIM prices by size
- 1 GB: ONE eSIM at $1.57 (7 days); next cheapest is Saily at $3.99 (3 days).
- 3 GB: ONE eSIM at $4.13 (15 days); next cheapest is Saily at $7.99 (7 days).
- 5 GB: ONE eSIM at $6.55 (30 days); next cheapest is Saily at $11.99 (7 days).
- 10 GB: ONE eSIM at $11.77 (30 days); next cheapest is Nomad at $17.50 (30 days).
- 20 GB: ONE eSIM at $22.55 (30 days); next cheapest is Nomad at $25.00 (30 days).
United Kingdom eSIM prices compared (1 GB to 20 GB)
| Data | ONE eSIM Our price | Airalo | Holafly | Saily | Nomad |
|---|---|---|---|---|---|
| 1 GB | $1.57 (7 days) Cheapest, saves $2.42 | $4.00 (3 days) | – | $3.99 (3 days) | $4.50 (7 days) |
| 3 GB | $4.13 (15 days) Cheapest, saves $3.86 | $8.50 (3 days) | – | $7.99 (7 days) | $9.00 (30 days) |
| 5 GB | $6.55 (30 days) Cheapest, saves $5.44 | $12.00 (7 days) | – | $11.99 (7 days) | $12.00 (30 days) |
| 10 GB | $11.77 (30 days) Cheapest, saves $5.73 | $18.00 (7 days) | – | $17.99 (7 days) | $17.50 (30 days) |
| 20 GB | $22.55 (30 days) Cheapest, saves $2.45 | $30.00 (15 days) | – | $29.99 (15 days) | $25.00 (30 days) |
Holafly sells only unlimited plans for the United Kingdom, so it has no price in the GB rows; its 7-day plan is in the week table below.
A week of unlimited data in the United Kingdom
| Provider | 7 days | What you get |
|---|---|---|
| ONE eSIM | $10.43 | 1 GB a day at full speed, then 512 Kbps until the next day (7 × $1.49) |
| Airalo | $27.00 | 3 GB a day at full speed, then 1 Mbps (fair use) |
| Holafly | $27.50 | No daily cap; fair use may slow very heavy use |
| Saily | $26.99 | 5 GB a day at full speed, then up to 1 Mbps |
| Nomad | $25.00 | 2 GB a day at full speed, then 1 Mbps |
For a week, ONE eSIM's 1 GB a day plan is the cheapest way to stay online all day at $10.43. The cheapest of the others is Nomad at $25.00, which gives more full-speed data a day; compare by how much you use a day, not by the word unlimited.
Networks and coverage in United Kingdom
ONE eSIM's United Kingdom plans run on EE [5G], 3 [4G]. EE carries 5G across the UK, while 3 is listed here as a 4G-only backup partner. As with any eSIM, you're on the same physical network as a local SIM, so signal strength should match a phone bought in the country, with no shop visit required.
Which eSIM should you choose for the United Kingdom?
- Short trip, light use (up to 3 GB): ONE eSIM's 3 GB plan at $4.13 (15 days), the cheapest at that size.
- Two weeks or more (5 to 10 GB): ONE eSIM's 10 GB plan at $11.77 (30 days), the cheapest at that size.
- Heavy use (20 GB): ONE eSIM's 20 GB plan at $22.55 (30 days), the cheapest at that size.
- Streaming or video calls every day: compare the unlimited plans above by how much full-speed data each gives a day.
How to set up your United Kingdom eSIM
- Check your phone supports eSIM and is carrier-unlocked.
- Buy and install the eSIM on Wi-Fi before you fly, so the QR code or activation profile downloads without using mobile data.
- Turn on the eSIM line and enable data roaming once you land in United Kingdom, then confirm you have a signal before leaving the airport.
United Kingdom eSIM FAQ
- Do I need an eSIM for the UK? No, but it's usually cheaper and quicker to set up than roaming on your home SIM or buying a local physical SIM.
- Can I keep my home number active with a UK eSIM? Yes, most phones support dual SIM, so your home number stays on standby for calls and texts while the eSIM handles data.
- What happens if I use all my data in the UK? Total-data plans usually stop or throttle to a very low speed; daily and unlimited plans slow down after their cap rather than cutting off, as shown in the tables above.
- Which network will my UK eSIM use? ONE eSIM's UK plans connect to EE [5G] or 3 [4G]; other providers may use different local partners.
How we check prices
We read each provider's public United Kingdom page on 27 October 2026 and took its cheapest plan at or above each size, in US dollars before any coupon, with the validity in brackets; ONE eSIM prices are our live list prices on the same day. Prices move, so we re-check every month and keep the date on the page and in the short answer. If a number is out of date, write to support@oneesim.app and we will correct it.
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