Japan & Korea eSIM

Doing Japan and Korea on one trip? Buy one eSIM per country rather than a single regional profile — you get the local carrier signal in each place instead of a roaming fallback. For Japan the choice comes down to your handset: iPhone users can take the SoftBank Japan eSIM, while Android users should take the dual-network KDDI + SoftBank plan. For Korea there are two. If you want the strongest signal and never want to think about data, take the native SKT Korea eSIM — Korea’s largest carrier, unlimited with no throttling. If you would rather buy only what you need, the Korea eSIM lets you pick a total or per-day allowance, 3 to 30 days.

How to choose a Japan eSIM

How to choose, plan comparison and FAQs (tap to open)

Japan is one of the few markets where handset compatibility genuinely decides the plan. Our SoftBank profile is built around iPhone and will not install on most Android devices, so it is listed as an iPhone recommendation rather than a general one. The dual-network plan carries both KDDI and SoftBank, which means an Android phone has a profile it can actually accept, and any phone gets a second network to fall back on when one is congested — useful around Shibuya at rush hour or inside a packed Kyoto bus.

Plan	Network	Best for	Plan styles	Trip length
Japan SoftBank eSIM	SoftBank	iPhone users, Japan-only trips	1/2/3/5GB per day, or unlimited	1–30 days
Japan Dual Network (KDDI + SoftBank)	KDDI & SoftBank	Android users, or anyone wanting a fallback network	3/5/10/20GB total, 1/2/3GB per day, or unlimited	1–30 days
Japan KDDI Native Unlimited	KDDI (native)	Heavy data users, all-day navigation, video	Native high-speed unlimited	3–15 days
Native SKT Korea eSIM	SKT (native)	Heavy use, no data maths — Seoul, Busan, Jeju, nationwide	Unlimited, not throttled (only option)	3–30 days
Korea eSIM	SKT	Buying just what your trip needs, short or long	5/10/20GB total, 1/2/3GB per day, unlimited also available	3–30 days

Pricing and the exact day/data combinations available are shown on each product page.

Frequently asked questions

Can one eSIM cover both Japan and Korea?

Not on these plans. Each profile is a local carrier plan for a single country, which is why the signal quality holds up. For a two-country trip, buy both and install each one on the day you arrive in that country.

Which Japan eSIM works on Android?

The dual-network KDDI + SoftBank plan. The SoftBank-only profile is built for iPhone and will not install on most Android handsets. If you are on a Pixel, Galaxy or any other Android device, choose the dual-network plan.

Does the Korea eSIM work on Jeju Island?

Yes. The SKT network covers Jeju as well as Seoul, Busan and Haeundae, and no separate plan or setting is needed when you fly down.

Does unlimited data actually stay fast?

On the Korea SKT unlimited plan and the Japan KDDI native unlimited plan, yes — those are sold as high-speed plans without a throttle threshold. Other unlimited options operate under a fair usage policy, which is stated on the product page.

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

Do not take the smallest tier — around 3GB a day is a safer target, and Japan also offers 3/5/10/20GB total-data plans, which are usually our first recommendation because a heavy day will not leave you stuck. Choose unlimited if you stream video, upload a lot of photos or share the connection with a laptop.