Best eSIM for Japan: Saily, Nomad and what to check

An eSIM is the easiest way to stay online in Japan. You install it before you fly, turn it on when you land, and skip the airport queue for a SIM card or a pocket Wi-Fi rental.

Short answer: for most trips, choose Saily for the simplest setup or Nomad if you want to compare on price per GB. Whichever you consider, check which Japanese network the plan uses, because that matters most outside the big cities. No eSIM is the best for everyone, and many roundups online are written by companies ranking their own product first.

We earn a commission from Saily and Nomad, so we only compare those two in detail. Other established providers such as Airalo and Ubigi also sell Japan plans and are worth a price check.

What to check before you buy

The network. Japan's main networks are NTT Docomo, KDDI (au) and SoftBank. All three are strong in the cities. Docomo is the one most often recommended for rural areas, so if you are heading to the mountains or smaller islands, check which network your plan uses. The provider lists it on the plan page.

How much data you need. Maps, translation and transit apps are light users. Video calls, streaming and hotspot use are not. For a two-week trip, most people who use data all day without streaming do well with a mid-sized or unlimited plan. It is usually cheaper to buy slightly more than to top up often.

Your phone. It needs to support eSIM and be unlocked. Check this before you buy, because a locked phone may refuse the plan even if the hardware supports it.

Validity. Make sure the plan covers your full trip. On most plans the clock starts when the eSIM connects in Japan, not when you buy it, but check the terms.

What is different about Japan

No Japanese phone number. Travel eSIMs are normally data only. That is fine for messaging apps and most bookings, but a few restaurants and services ask for a local number. If you need one, ask your hotel to help with reservations, or look for a plan that includes a number.

You will lean on your phone a lot. Train connections, translation and maps all depend on data, and in Japan you will use them all day. This is not a country where you want to run out mid-transfer.

Expect gaps in remote areas. Download offline maps before heading to the mountains or smaller islands, whichever network you are on.

When Saily fits

Saily is a good fit when:

• You want simple setup through a well-designed app.
• You plan to share your connection with a laptop or a second device, since its hotspot use is not capped.
• You are combining Japan with other countries, and want the same app throughout.

When Nomad fits

Nomad is a good fit when:

• Price per GB matters most, especially if you use a lot of data.
• You want a second eSIM as a backup on a trip that matters.
• Your trip continues to a less-travelled destination that other providers do not cover.

When an eSIM is not the right choice

Pocket Wi-Fi can make more sense if a group is sharing one connection, or if your phone does not support eSIM. You will need to collect it, keep it charged, and return it.

Your home carrier's roaming plan may be simplest on a very short trip if the daily price is reasonable, and it keeps your normal number working.

Setting it up

1. Buy and install at home, on Wi-Fi, a day or two before you fly.
2. Leave the eSIM switched off until you land, unless your provider says otherwise.
3. On arrival, switch it on, set it as your data line, and turn on data roaming for that line.
4. Keep your home SIM on for texts if you need bank codes, with its data turned off to avoid roaming charges.

If it does not connect, the eSIM troubleshooting guide goes through the causes in order.

Common questions

What is the best eSIM for Japan?

There is no single best one. Saily is a good choice for simplicity and hotspot use, and Nomad for price per GB. The network matters more than the brand if you are going somewhere rural, so check it before you buy.

Which network is best in Japan?

All three main networks work well in the cities. NTT Docomo is usually recommended for rural coverage. Check which network a plan uses before you buy.

Do Japan eSIMs include a phone number?

Most travel eSIMs do not. They give you data, so you can call and message through apps, but you will not get a Japanese phone number. Some specialist plans include one.

Is an eSIM better than pocket Wi-Fi in Japan?

For one person, usually yes, because there is nothing to collect, charge or return. Pocket Wi-Fi can be better value for a group sharing one connection.

Can I buy an eSIM after I land in Japan?

Yes, if you can get online, and airport Wi-Fi is enough. It is still easier to install at home on a stable connection.

Planning the rest of the trip

Your route decides how much coverage you need, so sort that out first. The Tokyo travel guide covers the city, the Saily vs Nomad guide compares the two more widely, and ChatYourTrip can lay out a Japan route day by day.