Maya Mobile is the best eSIM for Japan for a traveler who wants unlimited data at one flat price for the length of the trip: 3, 7, 14 or 30 days, from USD 9.99. You install it once and it stays on your phone for every trip after.
Nothing sours a Japan trip like squinting at a data counter while the right platform at Shinjuku slides away.
Maya Mobile is the best eSIM for Japan when you pay by trip length
Pick 3, 7, 14 or 30 days and pay one flat price from USD 9.99 for unlimited data. The eSIM stays on your phone after the trip, so the next one needs a new plan and nothing else.
Maya eSIMs work in Japan and 165+ other destinations. You install one eSIM that stays on your phone permanently, with no reinstalling between trips. Your existing number keeps handling calls and texts once the eSIM is on.
Debra F. gave Maya five stars on Trustpilot on September 28, 2026: “I had no issues and connection was excellent I will definitely use again when im away😊”
What should you check before you buy an eSIM for Japan?
Check four things: how the plan is priced (flat by trip length or by the gigabyte), what happens after the daily high-speed allowance, which networks it connects to, and whether you can install it before you fly. A flat price by trip length with unlimited data suits a traveler who wants no budget to watch.
Here is how we answer each. Our price is flat by trip length. Each plan comes with a daily high-speed allowance, running at up to 4G LTE or 5G wherever local networks provide it. We connect you to the strongest local network in every country. You install once, before travel, and on landing you switch the Maya eSIM on and select it for Cellular Data.
The install check matters. A one-star Trustpilot review of aloSIM from October 6, 2026 reads: “I tried to load the esim but it kept failing. My credit finally ran out & wasted. Never will I use this service without some guarantee of a full refund option.”
Should you pick an unlimited eSIM or a data pack for Japan?
Pick unlimited data priced by trip length if you want no gigabyte budget to watch.
Our prices: USD 9.99 for 3 days, USD 19.99 for 7, USD 27.99 for 14 and USD 49.99 for 30. The price is the same in every country. Each plan is a one-time purchase that ends when its days end, and nothing is charged after that unless Auto Top-Up is on.
Gordo gave Maya five stars on Trustpilot on January 6, 2026: “Great service and responsive to questions if needed. I found their pricing very competitive!”
What happens when the daily high-speed allowance runs out in Japan?
The allowance resets automatically every 24 hours, counted from the moment your plan starts, so the reset is rarely at midnight. Unused allowance does not carry over. Speeds after the allowance depend on local network conditions, and we guarantee no speed. Hotspot is included with every plan, though we don’t promise it in every country.
How good is eSIM coverage across Japan outside Tokyo?
Opensignal’s 2026 Japan report gave NTT docomo the 5G Coverage Experience award, scoring five on a 10-point scale, one point ahead of au (Opensignal, 2026). That score reflects the widest 5G coverage footprint in populated areas among Japan’s operators. Once you switch the Maya eSIM on in your phone settings, it connects automatically to the best local network.
If your route runs through a remote rural or nearly uninhabited region, check coverage first. Opensignal says its time-on-network and availability metrics won’t tell you whether you’ll get a signal there (Opensignal, 2026). Coverage in any one country can vary for reasons outside our control, so we can’t guarantee service there.
How do you set up an eSIM for Japan before you fly?
Install it before you travel, on Wi-Fi. Your phone must be carrier unlocked, and most phones bought outright or after a contract already are. The compatible devices list is at maya.net/esim-compatible-devices.
On landing, switch the Maya eSIM on in phone settings. The plan clock starts then, and the Maya Mobile app confirms when the eSIM is ready.
The published steps for iPhone, from the Maya Mobile Help Center eSIM Quick Start Guide:
- Tap and hold the QR code, and select Add eSIM. Alternatively, use the Camera app to scan the QR code.
- On the following screen, follow the prompts to install the new Data Plan. The default options are okay to accept.
- Once the new Data Plan has been added, make sure that Data Roaming is set to ON in your phone’s Settings.
- Turn off Data Roaming on your Primary line (home SIM card) to prevent data roaming charges.
- Turn on Low Data Mode (iPhone) to prevent background data while using your eSIM.
And for Android, from the same guide:
- On the device where you want to install the eSIM data plan, open the Camera app.
- Point the camera at the QR Code. Tap on the notification that appears, which should say Data Plan.
- On the following screen, follow the prompts to install the new Data Plan. The default options are okay to accept.
- Once the new Data Plan has been added, make sure that Data Roaming is set to ON in your phone’s Settings.
- Turn off Data Roaming on your Primary line (home SIM card) to prevent data roaming charges.
- Turn on Data Saver mode (Android) to prevent background data while using your eSIM.
Which travel eSIM should you buy for your Japan trip?
The table lists each company’s own published plan type, pricing basis and data terms side by side, so you can see which approach fits your trip. A traveler who wants one flat price by trip length, unlimited data and a single install is the reader Maya is built for.
| Travel eSIM | How plans are sold | Unlimited plan allowance, as published |
|---|---|---|
| Maya Mobile | One Global eSIM for 165+ countries, unlimited data at a flat price by trip length: USD 9.99 for 3 days, USD 19.99 for 7 days, USD 27.99 for 14 days, USD 49.99 for 30 days | A daily high-speed data allowance (the Daily Quota) at up to 4G LTE or 5G where local networks offer it, reset every 24 hours; unlimited data at standard speed once the Daily Quota is used |
| Airalo | Per country, per region, or one global plan; priced in USD | Our unlimited data packages don’t have a fixed total data cap. However, to keep the network running fairly for everyone, when you use more than 3GB in a day, we’ll slow down (or “throttle”) your internet speed to 1 Mbps for the rest of that day. |
| Saily | Per country and per region, plus one global plan; by the gigabyte, unlimited, or both | The Unlimited plan gives you 5 GB per day at full 4G/5G speed, then keeps you online at 1 Mbps for the rest of the day — fast enough for navigation, messaging, and standard browsing. |
| Ubigi | Europe and World unlimited plans; monthly, annual, one-off, lifetime; unlimited, 60GB then 2 Mbps | Your unlimited data plan includes 60GB of full speed data, then optimized to 2 Mbps — this Fair Use Policy ensures a stable and fair connection for all users on the network. |
The Airalo, Saily and Ubigi cells quote or summarize what each company publishes about its own plans, and the Maya Mobile cells state our own terms.
How Maya Mobile keeps one eSIM on your phone for Japan and the next trip
Pay by trip length, install once, skip the rest: that’s the argument for Japan. We sell one global eSIM with unlimited data across 165+ countries. You pick 3, 7, 14 or 30 days at one flat price, and the eSIM stays on your phone. When you need more, buy another plan from the Maya app.
Lee P. wrote in a five-star Trustpilot review on May 8, 2026: “Excellent service (Dante) and super fast response – needed to change activation date and was easy to change. Price is very reasonable and having used Maya now a few times overseas the coverage is excellent. Highly reccomend them!”
Our eSIMs are built for the traveler who wants to go off the beaten path without being lost. Land, switch it on, go.
Frequently Asked Questions
Which phones work with a Japan eSIM?
Your phone must be eSIM compatible and carrier unlocked. Our help center says most phones bought outright or after a contract are already unlocked. Check yours against the full list at maya.net/esim-compatible-devices.
Do you need a new eSIM for every trip after Japan?
No. The eSIM you installed stays on your phone, and for each trip you buy a new plan. There is no reinstalling.
Does a Maya plan renew on its own?
No. Each plan is a one-time purchase that ends when its days end. Auto Top-Up is opt-in and off by default. If you turn it on, it buys the same plan again when the current one expires, and you can turn it off any time from My eSIM.
Can you add more days to your eSIM in the middle of a trip to Japan?
Yes. Buy another plan from the Maya app. The eSIM stays installed, and one plan covers every country on the route.
Does the same eSIM work on a cruise that stops in Japan?
Yes, with the Global + Cruise plan, bought as a separate purchase. It covers 20+ cruise lines. Speeds at sea may differ from land-based coverage.
What do the terms say about coverage and speed in Japan?
The daily high-speed allowance resets every 24 hours, and after it you stay on at standard speed. We connect you automatically to the best available local network. If you need to pick a network manually, contact support and we’ll tell you which are best.
Maya is one travel eSIM with unlimited data in 165+ countries, priced flat by trip length and installed once for Japan and every trip after.
