Best unlimited eSIM for Japan: six brands compared
The best unlimited eSIM for Japan depends on how much full speed data you use a day. When we checked on 8 October 2026, at about 1GB a day RoamMore's Endless cost less than every unlimited plan we found, for a week, for two weeks and for a month. At 2GB a day Nomad cost less for a week and for two weeks, and at 3GB a day or more Jetpac, Airalo and Ubigi cost less than Endless. So decide your daily amount first, then pick the plan.
RoamMore wrote this page and sells Endless, so read it with that in mind. Every rival price below was read on the brand's own Japan page on 8 October 2026, in US dollars, and links back to that page. Our prices come from our live catalogue and change when it does. If you spot a mistake, email [email protected] and we will fix it.
How do the unlimited Japan eSIMs compare?
| Brand | Full speed a day | 7 days | 14 days | 30 days |
|---|---|---|---|---|
| RoamMore with BIRTHDAY30 | Endless 0.5GB, then 512 kbps | |||
| RoamMore with BIRTHDAY30 | Endless 1GB, then 1 Mbps | |||
| RoamMore with BIRTHDAY30 | Endless 2GB, then 1 Mbps | |||
| RoamMore with BIRTHDAY30 | Endless 3GB, then 1 Mbps | |||
| RoamMore with BIRTHDAY30 | Endless 5GB, then 384 kbps | |||
| RoamMore with BIRTHDAY30 | Endless 10GB, then 384 kbps | |||
| Airalo | 3GB, then 1 Mbps | US$26.50 | 15 days: US$48 | US$69 |
| Holafly | No daily amount stated | US$27.50 | 15 days: US$50.50 | US$73.90 |
| Nomad | 2GB, then 1 Mbps | US$25 | US$41 | Not sold |
| Jetpac | 3GB, then up to 1 Mbps | US$25.99, a sale price | 15 days: US$41.99, a sale price | US$65.99, a sale price |
| Ubigi | Varies by plan, then 2 Mbps | 8 days, 5GB a day: US$25 | 15 days, 30GB in all: US$39 | US$65, 60GB in all |
Endless prices any number of days, so its rows show 7, 14 and 30. Where a brand sells 15 days or 8 days instead, the cell says so. Jetpac showed its prices as discounts from a higher struck price, and a sale can end at any time. We left Saily out: its Japan page refused our reader both times we asked (HTTP 403), so we could not check its prices on the day.
How much full speed data do you use a day?
These are the daily amounts our plan finder uses. Not sure? Most people are Standard.
| Your use | A day | One week | Two weeks |
|---|---|---|---|
| Lite | 300MB | 2.1GB | 4.2GB |
| Standard | 1GB | 7GB | 14GB |
| Heavy | 2GB | 14GB | 28GB |
Lite is maps, messages and browsing with hotel wifi most evenings, so Endless at 0.5GB a day covers it. Standard is a full day out on your phone, about 1GB. Heavy is streaming, long video calls or sharing your connection with a laptop, 2GB a day or more. Our cost and data guide breaks the figures down by app.
Which unlimited eSIM is best for your daily use in Japan?
- About 1GB a day. Endless is US$14.50 for a week, less than any unlimited week in the table, and US$28.70 for 15 days, less than any 15 day plan and less than Nomad's 14 days. For a month it is US$55.40, less than Ubigi's, Jetpac's, Airalo's and Holafly's 30 day plans. Each of those gives you more full speed data a day, so you are paying less for less.
- About 2GB a day. Nomad's week is US$25 against US$26.40 for Endless, and its 14 days are US$41 against US$50.80, so Nomad is the better buy. For a month at 2GB a day or more, Ubigi's 30 days with 60GB in all, Jetpac's and Airalo's all cost less than Endless.
- 3GB a day or more. Jetpac's week is US$25.99 at a sale price and Airalo's is US$26.50, against US$40.40 for Endless at 3GB, so either is the better buy. Ubigi's 8 days at 5GB a day are US$25, less than either of those weeks at 3GB a day.
- You would rather not count anything. Holafly's week is US$27.50 and states no daily amount at all, only that a network may slow heavy use for up to a day.
Endless charges one trip price for the exact number of days you pick, so a 12 day trip is priced for 12 days, not the nearest pack. Our guide to what unlimited really means explains daily amounts and the slower speeds after them.
How do the hotspot and the daily refill work?
On Endless the full speed amount refills every 24 hours, counted from when the eSIM first connects in Japan, not at midnight. Once you use the day's amount, the eSIM keeps working at its cruising speed: 1 Mbps on the 1GB, 2GB and 3GB sizes, enough for maps, messages and music, and slower on the 0.5GB, 5GB and 10GB sizes. You can share the connection as a hotspot, and what you share counts toward the day's amount.
Jetpac's page says its first 3GB every 24 hours run at full speed, then up to 1 Mbps until the next 24 hour cycle, and that its eSIM includes unlimited hotspot. Nomad's page says its high speed data resets every 24 hours from when you activate it, and that its eSIMs support tethering. Airalo states 3GB a day. Holafly lets you share 1GB a day, so a 7 day plan includes up to 7GB of shared data. Ubigi's 15 and 30 day plans have no daily refill: one amount covers the whole plan, then 2 Mbps.
When do the days start?
Endless starts when the eSIM first connects to a network in Japan, so you can install it at home and it waits. Airalo's Japan plans start on first use. Holafly's start when the eSIM connects to a supported network. Nomad's start when the eSIM connects, or after 60 days if it has not. Ubigi's start when you arrive in a country the plan covers. Jetpac activates the pack within minutes of arrival, and keeps a pack you have not activated in your account for 3 months from purchase.
Who should buy what?
- Buy Endless if you use about 1GB a day or less, for any length of trip. It was the cheapest unlimited option we found at that amount, the Japan page lists the networks it uses, and a real person answers by email or WhatsApp.
- Buy Nomad if you use about 2GB a day for a week or two.
- Buy Jetpac or Airalo if you use 3GB a day, or want a month of heavy use.
- Buy Ubigi for a short heavy trip: its 8 day plan gives 5GB a day, then 2 Mbps.
- Buy Holafly if you would rather not see any daily number, and know a network may still slow very heavy use.
How did we check these prices?
We read every rival price on 8 October 2026 on the brand's own Japan page, in US dollars (Airalo with its own currency setting), with no codes, credits or memberships, and read each page a second time to confirm it. We did not go through any checkout. Prices change, so each one links to the page it came from, and we check them again each month. For fixed data plans in Japan, see the best eSIM for Japan.
Prices for popular trips
Cheapest plan with 1GB or more, in US dollars from our catalogue, updated 27 Sep 2026.
Questions travellers ask
What is the best unlimited eSIM for Japan?
It depends on how much you use a day. On 8 October 2026, at about 1GB a day, RoamMore's Endless cost less than every unlimited plan we found for a week, two weeks and a month. At 2GB a day Nomad cost less for a week and for two weeks. At 3GB a day or more, Jetpac's and Airalo's weeks cost less, and Ubigi's 8 day plan gives 5GB a day for less than either of those weeks. RoamMore wrote this answer, and every rival price on the page links to the store it came from.
Is Holafly or Airalo better for unlimited data in Japan?
On price, Airalo. On 8 October 2026 Airalo's Japan unlimited plans cost less than Holafly's for 7, 15 and 30 days, and Airalo states its terms, 3GB a day at full speed, then 1 Mbps. Holafly states no daily amount, says a network may slow heavy use for up to a day, and lets you share 1GB a day as a hotspot.
Is unlimited data in Japan really unlimited?
You never run out, but the full speed part has a limit on most plans. Airalo gives 3GB a day, Nomad 2GB and Jetpac 3GB before the speed drops to about 1 Mbps. Ubigi's 15 and 30 day plans give a set amount for the whole plan, then 2 Mbps. On Endless you choose the daily amount, and after it the eSIM keeps going at its cruising speed until the next refill.
Which unlimited eSIM is cheapest for a month in Japan?
At about 1GB a day, RoamMore's Endless was the cheapest month we found on 8 October 2026. If you use 2GB a day or more, Ubigi's, Jetpac's and Airalo's 30 day plans cost less than Endless at 2GB a day. Nomad did not sell a 30 day unlimited plan for Japan.
Can I use an unlimited Japan eSIM as a hotspot?
On Endless, yes, and what you share counts toward the day's full speed amount. Holafly's Japan page allows 1GB of sharing a day, Jetpac's says its eSIM includes unlimited hotspot, and Nomad's says its eSIMs support tethering. Airalo's and Ubigi's Japan pages did not say, so ask them before you buy.
When does an unlimited Japan eSIM start counting days?
Endless starts when the eSIM first connects to a network in Japan, so you can install it at home before you fly, and its full speed amount refills every 24 hours from that moment. Airalo, Holafly and Nomad also start on first connection, Ubigi when you arrive in Japan, and Jetpac activates the pack when you land.