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eSIM for Japan: which plan suits you?
JetSimly · 2026-10-20 · Last updated: 2026-10-22
In Japan a JetSimly eSIM uses the KDDI/au, NTT docomo, Rakuten Mobile and SoftBank networks (4G/5G). All plans can be topped up. The 50 GB / 180 days plan runs on NTT docomo only.
Plans
- Fixed-data: 1 GB / 7 days, 3 GB / 30 days, 5 GB / 30 days, 10 GB / 30 days, 20 GB / 30 days, 50 GB / 30 days and 50 GB / 180 days.
- Daily: 1, 3, 5, 7 and 10 days. You get 2 GB a day at full speed; after that the speed drops to 1 Mbps, and the allowance resets about every 24 hours; the exact time can vary.
How to choose
You can see your daily use in your phone's cellular data counter. Under 2 GB a day, a fixed-data plan will do; above that a daily plan fits better, with 14 GB in total at full speed on a 7-day plan. Hotspot is on in every plan and no ID is needed. The plan starts the first time you connect to a network in Japan.
What the official sources say
The Japan National Tourism Organization (JNTO) describes eSIMs and pocket Wi-Fi as especially convenient for short-term visitors (japan.travel FAQ). JNTO's SIM guide also says the phone you use in Japan must be SIM-free (JNTO Mobile Tips); that page describes physical SIM cards and does not mention eSIM. Ask your carrier whether your phone is unlocked. Sources checked on 19 October 2026.
If you are also visiting South Korea, there is a Japan & South Korea plan. For a wider Asia route there is also the Asia (12 countries) plan, which includes Japan. All plans: Japan eSIM.
Frequently asked questions
Does hotspot work?
Yes, hotspot is on every plan.
What happens when the data runs out?
On a fixed-data plan the connection stops when the data runs out; you can add data or days before the plan ends. On a daily plan the speed drops to 1 Mbps once the allowance is used, and the allowance resets about every 24 hours; the exact time can vary.
Does the Japan eSIM also work in South Korea?
No, this plan is for Japan only. If you are visiting both, there is a Japan & South Korea plan.
Can I install the eSIM before I travel?
Yes. The plan starts the first time you connect to a network in Japan.