Japan · Staying connected

Best eSIM for Japan

An eSIM for Japan gets you online the moment you land, with no SIM shop or pocket wifi to collect. Here are the Japan plans from Airalo, Yesim and Saily side by side, and the best pick for each kind of trip.

Prices checked October 14, 2026 · By Atlas Ranger Editorial · How we research · Plan links are affiliate links (disclosure)

A smartphone showing a map route on a bullet train window ledge, with Mount Fuji outside
AI-generated illustration for Atlas Ranger

Best eSIM for Japan: the short answer

Japan eSIM prices: fixed data

The cheapest plan of each size from each provider, with how many days it lasts. Prices in US dollars, checked October 14, 2026. The lowest price for each size is marked.

DataAiraloYesimSaily
1 GB$4.003 days$4.4430 days$3.997 days · lowest
3 GB$7.503 days · lowestNot sold$7.9930 days
5 GB$10.007 days · lowest$10.5630 days$10.9930 days
10 GB$17.007 days · lowest$19.2030 days$17.9930 days
20 GB$24.0015 days · lowest$29.7630 days$24.9930 days
30 GBNot sold$39.6030 days · lowestNot sold

Airalo sells some sizes in other lengths too: 3 GB for 7 days ($8.00), 5 GB for 15 or 30 days ($10.50, $11.00), 10 GB for 15 or 30 days ($17.50, $18.00) and 20 GB for 30 days ($25.00).

Japan eSIM prices: unlimited data

Unlimited plans by trip length. Providers can slow speeds under fair-use rules; Saily states its plan gives full speed for 5 GB a day, then up to 1 Mbps.

LengthAiraloYesimSaily
3 days$11.50$3.83 a day · lowest$12.60$4.20 a dayNot sold
5 days$17.00$3.40 a day · lowest$21.00$4.20 a dayNot sold
7 days$26.50$3.79 a day · lowest$29.40$4.20 a dayNot sold
10 days$34.50$3.45 a day · lowest$34.57$3.46 a dayNot sold
15 days$48.00$3.20 a day$43.20$2.88 a day · lowest$48.99$3.27 a day
30 days$69.00$2.30 a day$66.00$2.20 a day · lowestNot sold
01

Airalo Japan eSIM

SoftBank, plus one other networkFrom $4.00

Why pick it

  • The widest choice of plan lengths: 3, 7, 15 and 30 days
  • Cheapest unlimited plan for a week or less
  • Cheapest 10 GB plan if your trip is two weeks or shorter

Worth knowing

  • Data only: no Japanese phone number
  • Shorter plans expire sooner than the same data from Yesim or Saily
AiraloSee all Airalo Japan plans
02

Yesim Japan eSIM

Switches to the fastest network available, including 5GFrom $4.44

Why pick it

  • Cheapest unlimited plans for two weeks or a month
  • The only one of the three with a 30 GB plan
  • Fixed plans all last 30 days; hotspot sharing is allowed; activate within 90 days of buying

Worth knowing

  • Data only: no Japanese phone number
  • Short unlimited plans cost more than Airalo's
YesimSee all Yesim Japan plans
03

Saily Japan eSIM

KDDI and SoftBankFrom $3.99

Why pick it

  • Cheapest small plans: 1 GB for $3.99, and 3 GB lasting 30 days for $7.99
  • Plans can be bought up to 180 days ahead and switch on when you land
  • Optional US phone number with a calls and texts plan

Worth knowing

  • Unlimited is a 15-day plan only: full speed for 5 GB a day, then up to 1 Mbps
  • The phone number is a US number, not a Japanese one
SailySee all Saily Japan plans

How much data do you need in Japan?

Most of what travelers use in Japan is light on data: maps, train route apps, translation and messaging. Video is what uses data up: streaming, video calls, uploading clips and sharing your connection with a laptop. If your week is mostly maps and messages, a 3 to 5 GB plan is the usual choice; if you post video every day or work online, an unlimited plan means you never have to watch the meter.

Free Wi-Fi is common in hotels and many stations, so the eSIM mostly covers you between them. Planning where to stay? The best area to stay in Tokyo guide compares neighborhoods on airport trains and price. Still choosing dates? See the best time to visit Japan, or the cherry blossom tracker for a spring trip.

eSIM vs pocket wifi vs SIM card in Japan

OptionGood forThe catch
eSIMSolo travelers and couples with eSIM phones; online the moment you land, nothing to collectYour phone must support eSIM and be unlocked
Pocket wifiGroups sharing one connection; phones without eSIMOne more device to collect, charge, carry and return
Physical SIMOlder unlocked phones without eSIMYou swap out your home SIM, so texts to your own number stop

Japan eSIM with a phone number

All three providers sell data-only plans for Japan, so none gives you a Japanese phone number. Saily offers an optional US number with a calls and texts plan. For most trips a number is not needed: restaurants and hotels can be reached through booking apps, and calls work over WhatsApp, LINE or FaceTime on data. Keep your home SIM switched on as a second line if you need texts such as bank codes, and turn off its data roaming.

How to set up a Japan eSIM

  1. Check your phone. It must support eSIM and not be locked to your carrier. Each provider has a compatibility checker.
  2. Buy and install before you fly. Installing needs an internet connection, so do it at home on Wi-Fi.
  3. Land and switch on. Turn on the eSIM line and data roaming for it, and set it as your data line. Turn off data roaming on your home SIM.
  4. Watch the dates. Yesim plans must be activated within 90 days of purchase; Saily plans can be bought up to 180 days ahead.

Questions people ask

What is the best eSIM for Japan?

It depends on how much data you use. For a one- or two-week trip, Airalo's 10 GB plan for 15 days is the cheapest of the three at $17.50. For unlimited data over two weeks or a month, Yesim is cheapest. For a short, light trip, Saily's 3 GB plan lasts 30 days for $7.99.

Is an eSIM or pocket wifi better for Japan?

An eSIM is simpler for one person: nothing to collect at the airport, nothing to charge or return, and it works from the moment you land. Pocket wifi makes more sense for a group sharing one connection, or if your phone does not support eSIM. All three eSIMs here are data plans, and Yesim states hotspot sharing is allowed.

Can I get a Japanese phone number with an eSIM?

Not with these three: Airalo, Yesim and Saily sell data-only plans in Japan. Saily offers an optional US phone number with a calls and texts plan. Most travelers use WhatsApp, LINE or FaceTime over data instead, and keep their home SIM switched on for texts such as bank codes.

How much data do I need for a week in Japan?

Maps, train apps, translation and messaging use little data; video, video calls and sharing a hotspot use the most. For a week of mostly maps and messaging, 3 to 5 GB is a common choice. If you stream or upload a lot of video, an unlimited plan avoids running out.

When should I install a Japan eSIM?

Install it before you fly, while you have Wi-Fi at home, and switch it on when you land. Yesim plans must be activated within 90 days of purchase; Saily plans can be bought up to 180 days ahead and start automatically when you arrive.

Do eSIMs work on every phone in Japan?

Only on phones that support eSIM and are not locked to your home carrier. iPhones from the XR and XS onward and many recent Android phones support eSIM; each provider has a compatibility checker on its site.

How this guide was put together

Prices, plan lengths, networks and plan terms are taken from each provider's own Japan page on October 14, 2026: Airalo (airalo.com), Yesim (yesim.app) and Saily (saily.com). Prices change, so the provider's page always has the final price. Picks are worked out from the tables above: the cheapest plan for each kind of trip. This guide covers the three eSIM providers Atlas Ranger links to.

Book the rest of your Japan trip

Partner links. Prices and availability are set by the partner. We may earn a commission, at no extra cost to you.

Plan the rest of Japan