10 GB
Data
30 days
Validity
$9.99
$1.00/GB
Three eSIM Japan 2026: Promo Code, Data Plans & Prices
Three eSIM Japan 2026: promo code, plans and prices. How much does it cost? Rates by days and GB, from the cheapest to the largest data package.
Traveling to more than one country? Add it to the search.
Updated Nov 9, 2026
Three plans and prices for Japan
Three for Japan FAQ.
Is there a Three promo code for Japan?
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Yes. Use our code when you buy a Japan plan on MobiMatter. Enter it at checkout.
How much does the cheapest Three eSIM for Japan cost?
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The cheapest Three eSIM for Japan costs $9.99 and gives you 10 GB for 30 days. It's the regional eSIM, which also works in other countries. We recheck prices daily, so this price is up to date. You can buy it on MobiMatter, the eSIM marketplace that sells Three plans.
Does Three work in Japan?
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Yes, Three works in Japan on its regional and global eSIMs. If your eSIM is installed but won't connect after you land, open your phone's settings and turn on data roaming for it. Your home SIM can stay as it is.
How much is a Three eSIM for Japan for 7, 15 or 30 days?
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On plans that include Japan, a 30-day Three plan starts at $9.99 for 10 GB. Three has no 7- or 15-day plan for Japan.
Does Three have an unlimited data eSIM for Japan?
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No, Three has no unlimited plans for Japan, so every plan comes with a set amount of data. Its plans run at full speed with no daily limit.
What is Three, and is it good for Japan?
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Three eSIMs are sold through MobiMatter, an eSIM marketplace, with plans covering 99 destinations.
How much does 1 GB of data cost with a Three eSIM in Japan?
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With Three, 1 GB in Japan can cost as little as $0.85 on the regional eSIM, which has 20 GB for 30 days.
Does Three have 5G in Japan?
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Yes, 5 of Three's 11 plans for Japan have 5G, so check the plan details before you buy. Your phone needs to support 5G too: on iPhone, that means an iPhone 12 or newer.
Can I use a Three eSIM as a mobile hotspot in Japan?
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Yes, every plan from 3 lets you share data through a personal hotspot.
Does Three have a phone plan with a number for Japan?
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No, the Japan plans from 3 are data only, so your home number stays on your main SIM. You can still call and message people through WhatsApp or other apps.
Can I buy a Three eSIM before my trip to Japan and use it later?
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Yes, you can buy it ahead, but install it within 2 months of purchase. The days start counting as soon as you install the eSIM, so install it shortly before your trip.
Can I top up a Three eSIM?
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Yes, you can top up a 3 eSIM in the MobiMatter app or on the MobiMatter site, with no new QR code. A top-up is a new package with its own days, and it doesn't extend the old one.
Does Three have a global eSIM that works in Japan?
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Yes, Three has 9 regional plans that cover Japan and other countries, plus 2 global plans starting at $41.99. These keep you online as you cross borders. Three has no Japan-only plan, so each of its eSIMs here also works in other countries.
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