URL: https://esimworld.co.uk/sim-card/japan/
Buy: https://esimworld.co.uk/esim-japan/
Source: eSIM World (esimworld.co.uk)
Author: Nadezhda Semenova, entrepreneur, co-founder of the Trippy travel service, https://esimworld.co.uk/author/
Updated: 26 October 2026
Prices: in pounds (GBP) at the rate of 31 Oct; the site shows the rate of the day.

# Best eSIM for Japan from the UK: eSIM, pocket Wi-Fi or a tourist SIM, compared

The best eSIM for Japan depends on what your UK network charges there. Sky leaves Japan out of its £2 Roaming Passport Plus and charges £2.16 a MB; EE puts it in Rest of World Zone 3, at £8 for 24 hours with 500MB (checked on 24 October 2026, [Sky tariff guide](https://www.sky.com/help/articles/sky-mobile-tariff-guide)). Our Japan eSIM from the UK is £2.99 for 1 GB over 7 days, data only. You have four ways to stay connected: your UK network, a travel eSIM, a local SIM or pocket Wi-Fi.

This site is not affiliated with any of the networks mentioned here; we sell eSIMs. [How we compare](https://esimworld.co.uk/how-we-compare/)

You may not need an eSIM. O2 Ultimate plans include Japan, and so do Three Complete plans, up to Three's 12GB roaming limit (checked on 24 October 2026). Otherwise, find your network's row below.

[See the Japan eSIM](https://esimworld.co.uk/esim-japan/)

## What do UK networks charge in Japan?

Roaming in Japan on UK networks costs £8 a day on EE, Vodafone and Three, and £1 to £5 a MB on Asda, SMARTY, Sky and Tesco (all rows checked on 24 October 2026). Sky, EE, Lebara and SMARTY put Japan in a different zone from the USA and Thailand, so a bundle that covers those may not cover Japan.

| Network | Japan charge | Condition | Checked |
|---|---|---|---|
| [EE](https://ee.co.uk/content/dam/help/terms-and-conditions/price-plans/mobile/sim-only-price-plans/_ee-pay-monthly-standard-and-non-standard-price-guide-31st_March_2026_1.1.pdf) | £8 for 24 hours, with 500MB | Rest of World Zone 3; runs from purchase; no data without a pass | 24 October 2026 |
| [Vodafone](https://www.vodafone.co.uk/newscentre/smart-living/everything-you-need-to-know-about/roaming-with-vodafone-in-2022-everything-you-need-to-know/) | £8 a day of use | Zone D, pay monthly from 11 August 2021 (£6 on earlier plans) | 24 October 2026 |
| [O2](https://www.o2.co.uk/international/data-roaming-bolt-ons) | O2 Travel £7 per 24 hours of use; Bolt Ons 1GB £9, 3GB £20, 5GB £29 | Zone 2, Pay Monthly only; included on Ultimate; no bolt-on, no data | 24 October 2026 |
| [Three](https://www.three.co.uk/content/dam/threedigital/terms-and-conditions/price-guides/latest-price-guides/threeyourwayplans-priceguide-post19apr2026-12102026.pdf) | £8 a day; 7-day pass £42, 14-day pass £84 | Around the World Extra; Lite and Lite+ joined or upgraded from 18 December 2025; included on Complete; not on PAYG | 24 October 2026 |
| [iD Mobile](https://www.idmobile.co.uk/help-and-support/roaming) | Roam Beyond: 2GB £5 for 1 day, 10GB £20 for 5 days, 20GB £35 for 10 days | Roam Beyond destination; £45 roaming data limit by default | 24 October 2026 |
| [Lebara](https://www.lebara.co.uk/en/roaming-add-on/p/44000067.html) | 1GB £12 for 8 days, 3GB £25 for 15 days | Zone 6 add-on | 24 October 2026 |
| [giffgaff](https://www.giffgaff.com/roaming) | 20p per MB, or a 30-day add-on of 1GB, 5GB or 10GB, "From £4" | Zone A; Japan add-on price in the app only; 30 days from purchase | 24 October 2026 |
| [Tesco Mobile](https://www.tescomobile.com/roaming) | £5 per MB | Region 4, pay monthly and pay as you go | 24 October 2026 |
| [Sky Mobile](https://www.sky.com/help/articles/sky-mobile-tariff-guide) | £2.16 per MB | Outside Roaming Passport Plus; the default £45 cap ends data at about 20MB (our arithmetic) | 24 October 2026 |
| [VOXI](https://www.voxi.co.uk/help/articles/what-are-global-roaming-extras-and-how-do-they-work----2cc71973-bb4a-436f-a6cd-1497441ed34d) | 2GB £16 for 8 days, 4GB £26.60 for 15 days | Global Roaming Extra, with minutes and texts; runs from purchase | 24 October 2026 |
| [SMARTY](https://cdn.smarty.co.uk/files/SMARTY-Price-Guide.pdf) | £1 per MB | Roaming 3, from out-of-plan add-ons; none loaded, no data | 24 October 2026 |
| [Talkmobile](https://talkmobile.co.uk/booster-details) | 500MB £5 for 1 day, 5GB £20 for 8 days, 8GB £30 for 15 days | World Holiday Booster, Zone B; no data without one | 24 October 2026 |
| [Lyca Mobile](https://www.lycamobile.co.uk/en/roaming/) | 1GB £10 for 7 days, 2GB £20 for 14 days | PAYG country pass from top-up credit; up to 5 in 30 days | 24 October 2026 |
| [BT Mobile](https://www.bt.com/help/mobile/going-abroad/buying-mobile-data-add-ons-to-use-abroad/bt-mobile-travel-data-pass-add-on) | no figure printed | Zone 3, not on the 12-country Travel Data Pass; BT's Japan rate is only in a 2023 price list | 24 October 2026 |
| [Asda Mobile](https://mobile.asda.com/roaming-calling-abroad) | £1 per MB | World Group 1 | 24 October 2026 |

A per-MB rate adds up fast. 100MB comes to £500 on Tesco, £100 on [SMARTY](https://esimworld.co.uk/roaming/smarty/) and Asda and £20 on giffgaff; on Sky it would be £216, but the £45 cap stops data at about 20MB (our arithmetic). EE's pass works out at £16 a GB, because £8 buys 500MB. Vodafone charges only for days you use the phone; an EE pass runs 24 hours from purchase.

Your network's own page is the final word. Our [EE](https://esimworld.co.uk/roaming/ee/), [Vodafone](https://esimworld.co.uk/roaming/vodafone/), [O2](https://esimworld.co.uk/roaming/o2/), [Three](https://esimworld.co.uk/roaming/three/), [iD Mobile](https://esimworld.co.uk/roaming/id-mobile/) and [Sky](https://esimworld.co.uk/roaming/sky-mobile/) pages give the full rates.

## Is a travel eSIM worth it for Japan?

A travel eSIM is worth it when your network charges by the day or the MB: 14 days of use in Japan come to £112 on EE and Vodafone, £84 on Three and £25 on Lebara (our arithmetic, checked on 24 October 2026). Our 5 GB plan covers 30 days for £7.99, data only.

Trips to Japan are long: visits by residents of Great Britain averaged 22.8 nights in 2025, and 39.4% of them fell in April to June ([ONS Travel trends 2025](https://www.ons.gov.uk/peoplepopulationandcommunity/leisureandtourism/articles/traveltrends/2025)).

| Network or plan | 14 days | 21 days | How we added it up |
|---|---|---|---|
| EE, Zone 3 | £112 | £168 | £8 pass a day, 500MB each |
| Vodafone, pay monthly from 11 August 2021 | £112 | £168 | £8 a day of use |
| Three, Lite and Lite+ from 18 December 2025 | £84 | £126 | 14-day pass; for 21, plus a 7-day pass (£42) |
| Lebara | £25 | £37 | 15-day 3GB add-on; for 21, plus 8-day 1GB (£12) |
| Lyca, pay as you go | £20 | £30 | 14-day 2GB pass; for 21, plus 7-day 1GB (£10) |
| Sky | per MB | per MB | £2.16 a MB; data stops at the £45 cap |
| Our Japan plan, data only | 5 GB, £7.99 | 5 GB, £7.99 | one 30-day plan; 10 GB is £11.99 |

Prices: each network's own page, checked on 24 October 2026; the totals are our arithmetic.

These are different products. Every network row keeps your number; Vodafone and Three use your UK allowance, while EE, Lebara and Lyca give the data shown. Our plan is a data-only eSIM on a second line, so calls stay on your UK SIM; [keeping your UK number](https://esimworld.co.uk/help/keep-your-uk-number/) covers the set-up.

[Roaming or eSIM](https://esimworld.co.uk/roaming-or-esim/) walks through the same decision for any country.

## How we compared eSIMs for Japan (checked on 24 October 2026)

For 1 GB over 7 days, four sellers charged between £2.99 and £3.99 on 24 October 2026, against £2.99 for our plan. We left out promotions and US-dollar prices, and name no seller.

| Plan | Sellers' range, 24 October 2026 | Sellers in range | Our plan, data only |
|---|---|---|---|
| 1 GB, 7 days | £2.99 to £3.99 | 4 | £2.99 |
| 5 GB, 30 days | £7.48 to £12.99 | 4 | £7.99 |
| 10 GB, 30 days | £12.50 to £21.99 | 4 | £11.99 |

Price alone does not pick the best eSIM for Japan: speed limits differ, so compare the plan card.

Our Japan plans are GB and days plans. Each starts on first connection to a network in Japan, not when you buy it, and can be installed up to 365 days after purchase. The Japan listing names SoftBank and KDDI and marks both 5G. We give no 4G/5G coverage map and no speeds for Tokyo, Kyoto, Osaka or smaller towns; check the network's own map.

Install before you travel, at home on Wi-Fi, and switch the eSIM line on for mobile data when you land. Keep [data roaming off](https://esimworld.co.uk/help/data-roaming-settings/) on your UK line; on Sky, a call or a text in Japan still costs money.

An eSIM needs an eSIM-compatible phone: dial *#06#, and if an EID shows, the phone takes one. Our [how to install an eSIM](https://esimworld.co.uk/how-to-install-esim/) and [transfer an eSIM](https://esimworld.co.uk/help/transfer-esim/) guides have the menu paths.

## Pocket Wi-Fi or eSIM for Japan?

Pocket Wi-Fi is a rented router that shares one connection; an eSIM puts data on the phone itself. We have checked no rental prices, so we give none. Pocket Wi-Fi vs eSIM comes down to how many people share, and whether they stay together.

Pocket Wi-Fi suits a group wanting one device for several phones and a laptop, but it is one more thing to collect, charge and return. An eSIM suits travellers who split up for the day: each phone has its own data.

Sharing one eSIM as a hotspot? Our plan pages state no hotspot rule, so message us on [WhatsApp](https://esimworld.co.uk/go/uk) before you rely on it. Our [hotspot guide](https://esimworld.co.uk/help/esim-hotspot/) covers the phone side.

## Tourist SIM card in Japan: what to expect

We haven't checked local SIM prices, so we give none. A tourist SIM in Japan is bought in person or ordered ahead: take your passport, and expect prices and rules to vary by seller.

Japan SIM card vs eSIM comes down to practicalities. A local SIM gives you a Japanese number, but it takes your UK SIM's slot or a second line. An eSIM is installed at home and needs no shop.

Read the [Foreign, Commonwealth & Development Office (FCDO) travel advice for Japan](https://www.gov.uk/foreign-travel-advice/japan) before you book.

[Back to all SIM cards by country](https://esimworld.co.uk/sim-card/)

## Frequently asked questions

### What is the best SIM card in Japan?

It depends on the use. For data only, a travel eSIM installed at home. For calls on your own number, your UK network plus a pass. For a Japanese number, a local SIM; we have not checked local SIM prices.

### What SIM can I use in Japan?

Your UK SIM if your network roams there, a travel eSIM in an eSIM-compatible phone, or a local SIM bought in Japan. Sky, Tesco, Asda and SMARTY charge Japan data per MB, as does giffgaff without its add-on (checked on 24 October 2026).

### Is pocket Wi-Fi better than an eSIM?

Pocket Wi-Fi suits a group sharing one device; an eSIM suits one traveller who wants data on the phone with no device to charge. Our plan pages state no hotspot rule, so ask us before sharing one eSIM with a group.

*Sources are linked in the text; reviewed by Nadezhda Semenova. For the terms of your own contract, check with your network.*

## Sources

- [EE price guide, 31 March 2026 (PDF)](https://ee.co.uk/content/dam/help/terms-and-conditions/price-plans/mobile/sim-only-price-plans/_ee-pay-monthly-standard-and-non-standard-price-guide-31st_March_2026_1.1.pdf)
- [Vodafone roaming guide](https://www.vodafone.co.uk/newscentre/smart-living/everything-you-need-to-know-about/roaming-with-vodafone-in-2022-everything-you-need-to-know/)
- [O2 data roaming Bolt Ons](https://www.o2.co.uk/international/data-roaming-bolt-ons)
- [Three Your Way price guide, post 19 April 2026 (PDF)](https://www.three.co.uk/content/dam/threedigital/terms-and-conditions/price-guides/latest-price-guides/threeyourwayplans-priceguide-post19apr2026-12102026.pdf)
- [iD Mobile roaming](https://www.idmobile.co.uk/help-and-support/roaming)
- [Lebara roaming add-on](https://www.lebara.co.uk/en/roaming-add-on/p/44000067.html)
- [giffgaff roaming](https://www.giffgaff.com/roaming)
- [Tesco Mobile roaming](https://www.tescomobile.com/roaming)
- [Sky Mobile tariff guide](https://www.sky.com/help/articles/sky-mobile-tariff-guide)
- [VOXI Global Roaming Extras](https://www.voxi.co.uk/help/articles/what-are-global-roaming-extras-and-how-do-they-work----2cc71973-bb4a-436f-a6cd-1497441ed34d)
- [SMARTY price guide (PDF)](https://cdn.smarty.co.uk/files/SMARTY-Price-Guide.pdf)
- [Talkmobile Booster details](https://talkmobile.co.uk/booster-details)
- [Lyca Mobile roaming](https://www.lycamobile.co.uk/en/roaming/)
- [BT Travel Data Pass](https://www.bt.com/help/mobile/going-abroad/buying-mobile-data-add-ons-to-use-abroad/bt-mobile-travel-data-pass-add-on)
- [Asda Mobile roaming](https://mobile.asda.com/roaming-calling-abroad)
- [ONS Travel trends 2025](https://www.ons.gov.uk/peoplepopulationandcommunity/leisureandtourism/articles/traveltrends/2025)
- [FCDO: Japan travel advice](https://www.gov.uk/foreign-travel-advice/japan)