5 GB
Data
30 days
Validity
$5.99
$1.20/GB
IIJ eSIM Japan 2026: Promo Code, Data Plans & Prices
IIJ 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.
Updated Nov 9, 2026
IIJ plans and prices for Japan
IIJ for Japan FAQ.
Is there an IIJ 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 IIJ eSIM for Japan cost?
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The cheapest IIJ eSIM for Japan costs $5.99 and gives you 5 GB for 30 days. We recheck prices daily, so this price is up to date. You can buy it on MobiMatter, the eSIM marketplace that sells IIJ plans.
Does IIJ work in Japan?
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Yes, IIJ works in Japan on its Japan-only plans. 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 an IIJ eSIM for Japan for 7, 15 or 30 days?
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For Japan alone, a 30-day IIJ plan starts at $5.99 for 5 GB. IIJ has no 7- or 15-day plan for Japan.
Does IIJ have an unlimited data eSIM for Japan?
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No, IIJ 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 IIJ, and is it good for Japan?
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IIJ eSIMs are sold through MobiMatter, an eSIM marketplace, with plans for Japan only.
How much does 1 GB of data cost with an IIJ eSIM in Japan?
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With IIJ, 1 GB in Japan can cost as little as $0.60, on the plan with 50 GB for 30 days.
Does IIJ have 5G in Japan?
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Yes, every IIJ plan for Japan has 5G. Your phone needs to support 5G too: on iPhone, that means an iPhone 12 or newer.
Can I use an IIJ eSIM as a mobile hotspot in Japan?
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Yes, every IIJ plan lets you share data through a personal hotspot, and shared data uses the plan's allowance.
Does IIJ have a phone plan with a number for Japan?
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No, IIJ's Japan plans 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 an IIJ eSIM before my trip to Japan and use it later?
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Yes, you can buy it ahead, but activate it within 2 months of purchase. Depending on the plan, the days start with your first data use or as soon as you install the eSIM, so check the plan details before you buy.
Can I top up an IIJ eSIM?
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No, IIJ eSIMs can't be topped up. If you need more data, you buy a new eSIM.
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