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ESIM JAPAN · PUBLISHED PRICES COMPARED

Best eSIM for Japan (2026)

An eSIM is the simplest way to stay online in Japan: no rental pocket Wi-Fi to collect or return, and your data works the moment you land. We compared the Japan plans published by 5 providers for a typical 10-day trip. Right now Saily gives the best balance of price and features, while the cheapest plan that covers the trip costs $10.50.

Updated September 24, 2026Prices checked September 24, 2026

We may earn a commission if you buy through our links, at no extra cost to you. It never changes the computed ranking. Affiliate disclosure

At a glance

Plans compared for this trip

Plan shown: the cheapest plan of each provider that covers at least 10 days and 5 GB. Tap a column header to sort.

ProviderDataValidityPricePrice/GBJapanese network5GHotspotScoreCTA
Saily5 GB30 days$10.99$2.20/GBKDDI/SoftBankYesYes9.5View plan
Airalo5 GB15 days$10.50$2.10/GBSoftBank/KDDIYesNot stated9.3View plan
Yesim5 GB30 days$10.56$2.11/GBKDDIYesYes9.3View plan
HolaflyUnlimited10 days$36.50—KDDI/SoftBankYesYes6.2View plan
Drimsim5 GBPay as you go$69.84$13.97/GBNot publishedNot statedNot stated3.3View plan

Detailed ranking

  1. 1

    Saily

    Plan for this page: 5 GB · 30 days

    9.5/10
    Price
    $10.99
    Price/GB
    $2.20/GB
    Networks
    KDDI, SoftBank
    Hotspot
    Yes

    Pros

    • Unlimited plan available for Japan
    • Hotspot allowed
    • Two or more Japanese networks published

    Cons

    • Data only, no phone number
    See this plan — $10.99Read the Saily review
  2. 2

    Airalo

    Plan for this page: 5 GB · 15 days

    9.3/10
    Price
    $10.50
    Price/GB
    $2.10/GB
    Networks
    SoftBank, KDDI
    Hotspot
    Not stated

    Pros

    • Lowest price on this page
    • Lowest price per GB on this page
    • Unlimited plan available for Japan

    Cons

    • Data only, no phone number
    • Hotspot policy not stated
    See this plan — $10.50Read the Airalo review
  3. 3

    Yesim

    Plan for this page: 5 GB · 30 days

    9.3/10
    Price
    $10.56
    Price/GB
    $2.11/GB
    Networks
    KDDI
    Hotspot
    Yes

    Pros

    • Unlimited plan available for Japan
    • Hotspot allowed
    • 5G announced

    Cons

    • Data only, no phone number
    See this plan — $10.56Read the Yesim review
  4. 4

    Holafly

    Plan for this page: Unlimited · 10 days

    6.2/10
    Price
    $36.50
    Price/GB
    —
    Networks
    KDDI, SoftBank
    Hotspot
    Yes

    Pros

    • Unlimited plan available for Japan
    • Hotspot allowed
    • Two or more Japanese networks published

    Cons

    • Pricier than the page average
    • Data only, no phone number
    See this plan — $36.50Read the Holafly review
  5. 5

    Drimsim

    Plan for this page: 5 GB · Pay as you go

    3.3/10
    Price
    $69.84
    Price/GB
    $13.97/GB
    Networks
    Not published
    Hotspot
    Not stated

    Pros

    • Wide choice of plan sizes
    • Dedicated app

    Cons

    • No unlimited plan for Japan
    • Pricier than the page average
    See this plan — $69.84Read the Drimsim review

What matters here

Most visitors use between a few hundred megabytes and 1 GB a day: Google Maps, translation apps, train timetables and messaging barely touch your allowance, while video calls, streaming and hotspot sharing drain it fast. That is why each page of this guide starts from a real need — a trip length, a data size, a city or a traveler profile — and only keeps the plans that cover it.

Japan’s three main networks are NTT Docomo, KDDI (au) and SoftBank. Travel eSIMs connect through one or more of them. In the big cities coverage is rarely the issue; it matters more in the Japanese Alps, on remote islands and along rural roads, where a provider that publishes more than one partner network gives you a better fallback.

Two things are easy to miss before you buy. First, check that your phone is carrier-unlocked and eSIM-compatible. Second, look at the validity rule: most plans start counting days when the eSIM first connects in Japan, not when you install it, so you can set it up calmly at home on Wi-Fi.

If you travel as a group or carry a laptop, a single larger plan with hotspot sharing can replace several small ones. If you would rather not think about data at all, the unlimited plans shown here remove the arithmetic, at a higher daily price.

Guides on this site

How much data do you need?

Pick your trip length and how you use your phone. The assumptions are visible and editable.

Usage
Assumptions (MB per day)
Estimated data—Plan that covers it

—

Install your eSIM in 4 steps

  1. 1

    Buy the plan before you leave and keep the QR code or the app handy.

  2. 2

    Install the eSIM at home on Wi-Fi. Most plans only start the validity period once the eSIM connects in Japan.

  3. 3

    On landing, switch the eSIM on for mobile data and keep your home SIM for calls and texts if you need them.

  4. 4

    Turn on data roaming for the eSIM line, then check that the phone shows a Japanese network.

Your phone must be carrier-unlocked and eSIM-compatible. Check this in your phone settings before you buy.

Frequently asked questions

Which eSIM is best for Japan?

On the plans published today, Saily ranks first for a 10-day trip with at least 5 GB, and Airalo is the cheapest option that covers the same need at $10.50. The ranking is recalculated from published prices, so check the table above for the current order.

Does an eSIM work everywhere in Japan?

Travel eSIMs use the networks of Japanese carriers such as NTT Docomo, KDDI (au) or SoftBank, which cover cities and main transport corridors well. Coverage can be thinner in mountains, on small islands and in remote rural areas, so check which network a provider uses if you travel off the main routes.

How much data do I need for a trip to Japan?

With the assumptions used on this site, a light user (maps, messaging, search) needs about 0.3 GB a day, a medium user about 0.8 GB, and a heavy user 2 GB or more. Use the estimator on this page to adjust the assumptions to your own habits.

Should I choose an eSIM or a pocket Wi-Fi?

An eSIM is lighter and cheaper for one or two travelers with compatible phones. A pocket Wi-Fi can make sense for a large group sharing one connection, or if your phone does not support eSIM. Our Pocket Wifi vs eSIM guide compares both in detail.

Can I keep my home number with a Japan eSIM?

Yes. Most phones run two lines at once: keep your usual SIM for calls and texts, and use the Japan eSIM for mobile data. Turn off data roaming on your home line to avoid charges from your carrier.

When should I install my eSIM?

Install it before you leave, on a stable Wi-Fi connection, and activate it for data when you land. With most providers the validity period only starts once the eSIM connects to a network in Japan.

How we rank

We compare the plans each provider publishes for Japan. We do not rank on personal testing or user reviews. For each provider we take the cheapest plan that covers the need of this page, then compute a score out of 10:

  • Price (50%): cheapest plan on the page ÷ this plan’s price × 10.
  • Japanese network (20%): 10 if two or more networks are published, 8 for one, 5 if unknown.
  • Hotspot (15%): 10 if tethering is allowed, 0 if not, 5 if unknown.
  • Options (15%): app, top-up and an unlimited plan for Japan (10 each if yes, 0 if no, 5 if unknown).

At equal score, providers we have a partner link with are listed first. Prices change often, so check the final price on the provider’s site.