The short answer
Japan sits in Three's Go Roam Around the World Extra list, so your plan works there for a daily charge of £8 (about $11) on the days you use it, or for a pass bought in advance. I read Ringo Light as the cheaper way to cover a trip: $9.99 for 3 days, $21.99 for 2 weeks, $54.99 for 30 days, unlimited data at full speed. Three wins where it counts for a lot of people: your own number, calls and texts, nothing to install and a bill you already pay.
Ringo Light is unlimited data at full speed for 3 days at $9.99, 2 weeks at $21.99 or 30 days at $54.99, one payment, nothing renews. Three is £8 for every day you use the phone in Japan, and its terms do not allow hotspot use there, so I would not pair it with a laptop.
Pay the daily charge and your UK calls, texts and data work on your own number. Nothing to install, and it lands on the bill you already pay. A phone with no eSIM slot works too. Ringo Light is data only, and I say plainly that this is a gap.
Prices read on 31 October 2026: Three, European Central Bank, Ringo Light on their own sites or listings, Ringo Light from its catalogue. All in US dollars unless stated. Treat every number as a snapshot.
See the full price index for every country.
Travelling further? Compare the best eSIM for Asia and the eSIM for Asia-Pacific.
The prices, charted
Three is charged in pounds; dollar figures use the ECB reference rate of 30 October 2026, the latest published on 31 October, £1 = $1.34. Daily charges apply only on days the phone is used, so 14 days is the most they can cost for the fortnight. Ringo Light is priced in US dollars.
Three's pages list no 30-day pass, so 30 days is 30 times the daily charge, with the plan's data use abroad limited to 12GB a month under fair use. Dollar figures at £1 = $1.34, ECB reference rate of 30 October 2026. Ringo Light is one payment for 30 days.
Three days of use at each, dollar figures at £1 = $1.34 (ECB reference rate of 30 October 2026). Three is the only one of the two that also carries your calls and texts.
Side by side
Swipe to compare →
Head to head
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- Holafly vs Saily for Japan
- Airalo vs Ubigi for Japan
- Nomad vs Ubigi for Japan
- Holafly vs Nomad for Japan
- Airalo vs Ringo Light for Japan
- Airalo vs Holafly for Japan
Get Ringo Light for Japan, from $9.99.
Installed once, next to your own SIM. Your eSIM arrives by email in seconds.
- 3 days $9.99
- 2 weeks $21.99
- 30 days $54.99
We sell data eSIMs for now to fund the full Ringo service. Ringo is self funded. Every plan bought here pays for the build of one plan that works everywhere.
Want to keep your own number abroad?
That is the full Ringo service: one plan that works everywhere, with your own number included.
It is a separate product from Ringo Light and it is still being built, so it is not on sale yet. Join the waitlist to hear when it opens.
Three Go Roam vs Ringo Light in one paragraph
I priced Japan both ways, and Ringo Light costs well under Go Roam on any real trip. Two weeks is $21.99 against about $150 of daily charges or about $113 for the 14-day pass, a month is $54.99 against about $322, and a long weekend is $9.99 against about $32. Go Roam wins on convenience. Calls and texts work on your own number, nothing needs installing, it is billed on the account you already pay, and it works on a phone with no eSIM slot. A single day of use costs about the same as Ringo Light's 3-day trip, so the saving starts on day two. If you want zero setup and no second SIM, I would use Go Roam for a stopover.
Price: the same trip at each
Three's roaming destinations page, which I read on 31 October 2026, lists Japan in Go Roam Around the World Extra for Pay Monthly customers. The daily roaming charge in that band is £8 for customers who joined or upgraded on or after 18 December 2025, from 1 April 2026, and £7 for those who joined between October 2021 and 17 December 2025, so check which applies on your account. My figures use £8. Passes bought in advance are £17.50 for 3 days, £29.75 for 5 days, £42 for 7 days and £84 for 14 days.
At the ECB reference rate of 30 October 2026 (£1 = $1.34, the latest published on 31 October), a long weekend of daily charges is about $32, two weeks about $150 and 30 days about $322. Ringo Light is priced in US dollars and the checkout shows the amount in your own currency before you pay. Set against Ringo Light, the gap on two weeks is $91.01 against the 14-day pass and $128.01 against daily charges.
Data and speed at each
One Go Roam daily charge from Three unlocks your UK calls, texts and up to 12GB of data for 24 hours, and 12GB is a fair use limit per month on your plan's own data. Three's FAQ says usage over it is subject to a surcharge. Hotspot use is not permitted in Around the World Extra destinations, and I would weigh that before sharing a connection with a laptop in Tokyo or Kyoto. The pages give no speed figure and say partner networks may be slower. Ringo Light is unlimited data at full speed for the whole trip, hotspot included. Fair use policy, see Terms.
Calls, texts and your own number
On this row I give it to Three without hesitation. Your phone behaves as it does at home, so the same number rings, texts arrive as usual, and verification codes sent to that number keep reaching you. Ringo Light is data only. Calls go over apps that use data, and your number stays on your own SIM next to it. If your bank texts a code to your UK number while you are in Osaka, I would keep your own SIM active whichever you choose.
Setup and billing
With Go Roam there is nothing to set up. The charge begins when the phone is used in Japan and appears on your Three bill, and a pass can be added in advance in your Three account. Ringo Light arrives by email after you pay and installs in one scan of the QR code. I would scan it at home on Wi-Fi before the flight and switch the eSIM on for data when you land at Haneda or Narita. The phone must support eSIM. Go Roam has no such requirement.
What Ringo Light is, and what it is not
Ringo Light is the data eSIM from the company I write for, sold to fund the full Ringo, one plan that works everywhere. For Japan it sells three trips, all unlimited data at full speed: 3 days at $9.99, 2 weeks at $21.99 and 30 days at $54.99. One payment, nothing renews.
What it is not: it has no phone number, so it does not replace your Three line for calls and texts, and it needs a phone with an eSIM slot. Three is simpler and keeps everything on one bill. Ringo Light is the lower price for the same time in Japan, which is why it is what I would buy.
I compared the other travel eSIM brands for Japan at /blog/best-esim-for-japan. The card to buy Ringo Light is further up this page, just after the side-by-side table.
Which to pick
- ✓Ringo Light, for any trip beyond a day. Choose $9.99 for 3 days, $21.99 for 2 weeks or $54.99 for 30 days, unlimited data at full speed, against £8 for every day of use on Three.
- ✓Three Go Roam, for one day or a stopover. Nothing to install, and calls and texts stay on your own number, for £8 the day.
- ✓Three Go Roam, if your phone has no eSIM slot. It works on the plan already in the phone.
- ✓Both, for a long trip with a business line. Let Ringo Light carry the data and let your own SIM take the calls and texts your number needs.
Pick by trip
Ringo Light, 3 days, $9.99, is what I would buy. Three's 3-day pass is about $23 and three days of daily charges about $32.
My pick is Ringo Light, 2 weeks, $21.99. Three's 14-day pass is about $113 and daily charges about $150.
Ringo Light, 30 days, $54.99, unlimited at full speed for the laptop. Thirty days of daily charges would be about $322, and Three bars hotspot use there, so I would skip it for remote work.
Three Go Roam, or Ringo Light for data with your own SIM left in the phone for calls. Either works for me.
Three Go Roam, since I cannot point you to Ringo Light without an eSIM-capable phone.
Frequently asked questions
How we compared, and our sources
Three, European Central Bank, Ringo Light, Ringo Light
We priced Three and Ringo Light for Japan on 31 October 2026, all on the same day, in US dollars. Each rival's price comes from its own website where it showed dollars, otherwise from an esimdb.com listing, and every source and its date is listed below. Ringo Light's prices come from the catalogue our checkout charges.
We compare the trips people actually book: a week, two weeks and a month of unlimited data, and a 10 GB bucket. We read each brand's fair use and speed rules and quote them as the brands state them. We did not run speed tests, so this page makes no speed claims for any brand.
Ringo Light is our own product. We put it in the table on the same terms as everyone else, and where a rival is the better buy the page says so.
Left out: Other eSIM brands. Airalo, Holafly, Saily, Nomad and Ubigi sell Japan too and are priced in the full comparison at /blog/best-esim-for-japan. This page answers one question, Three or Ringo Light. Left out: Three Pay As You Go. Three's destinations page puts Japan under Rest of the World for Pay As You Go customers, not in Go Roam, so this page prices the Pay Monthly daily charge and passes only.
- Three: www.three.co.uk/go-roam, Go Roam daily charges, the 12GB fair use limit and passes at three.co.uk/go-roam, Japan in Around the World Extra at three.co.uk/support/roaming-and-calling-abroad/roaming-abroad/roaming-destinations, and the roaming FAQs, read 31 October 2026
- European Central Bank: www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml, euro reference rates of 30 October 2026, the latest published on 31 October 2026, used for the dollar figures (£1 = $1.34)
- Ringo Light: ringoesim.com/japan, the catalogue the checkout charges, read the same day
- Ringo Light: our own catalogue, the prices the checkout charges on 31 October 2026.
Written and priced by the Ringo team. Prices change often; if you spot one that has moved, tell us through the contact page and we will update the table.
