Best eSIM for Japan: Which Plan Fits a Trip to Tokyo, Kyoto, and Beyond
Verdict:For most trips to Japan, buy the Airalo Moshi Moshi eSIM: 10 GB for 30 days is $18, it runs on the SoftBank and KDDI networks, and its unlimited plans publish a clear 3 GB per day cap. Buy Nomad if you want the lowest price per GB, buy Holafly only if you want unlimited data sold by the day, and buy Ubigi if your route leaves the cities and you want NTT Docomo in the mix.
For most trips to Japan, the Airalo Moshi Moshi eSIM is the best eSIM to buy: 10 GB for 30 days costs $18, it connects to the SoftBank and KDDI networks, and its unlimited plans state their daily cap up front. If you only care about the lowest price per GB, Nomad is cheaper, and its 10 GB plan was $2 below Airalo’s when we checked. If your route leaves the big cities, Ubigi is the one that adds NTT Docomo to the mix.
The honest framing is that every plan in this guide is data-only. None of them gives you a Japanese phone number, so calls and texts go through LINE, WhatsApp, or FaceTime, and a bank text message will not reach you. Prices below were read from each provider’s own page on October 12, 2026, and they change often, so confirm the number at checkout.
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How much data you actually need in Japan
Most trips use less data than the “unlimited” marketing suggests. A week of maps, translation, train apps, and messaging fits in 3 to 5 GB, and a two-week trip with daily photo uploads fits in 10 GB. Heavy video streaming or tethering a laptop is the case where a bigger plan or an unlimited plan starts to earn its price.
Fixed-GB plans also have a practical advantage in Japan: they are cheap enough that buying 10 GB and ignoring the counter costs less than most unlimited plans. For the planning side of the decision, our guide to eSIM vs physical SIM for travel covers when a physical SIM is still the better call.
Airalo (Moshi Moshi): the best eSIM for Japan for most trips
Airalo sells Japan under its local “Moshi Moshi” eSIM, which runs on the SoftBank and KDDI networks and is data-only. The fixed plans scale cleanly: 1 GB for 3 days is $4, 5 GB for 7 days is $10, 5 GB for 15 days is $10.50, 10 GB for 30 days is $18, and 20 GB for 30 days is $25. The unlimited plans run $11.50 for 3 days, $26.50 for 7 days, $48 for 15 days, and $69 for 30 days.
Two details matter here. First, the unlimited plans slow to 1 Mbps after 3 GB per day, so “unlimited” really means “3 GB of full speed daily.” Second, Airalo’s help centre confirms personal hotspot works as long as your phone and the network support it, which makes it the easy pick if you tether.
The negative is price at the top end. A 7-day unlimited plan is $26.50 here, and Nomad’s equivalent is $25. If you are a light user, the fixed 5 GB or 10 GB plans are the better buy than anything unlimited.
Nomad is the cheapest per GB for most Japan trips. Its fixed plans are 1 GB for 7 days at $4, 3 GB for 30 days at $7, 5 GB for 30 days at $10, 10 GB for 30 days at $16 (listed on sale from $18), 20 GB for 30 days at $23, and 50 GB for 30 days at $35. At 50 GB that works out to $0.70 per GB, which nothing else here approaches.
The unlimited plans are $11 for 3 days, $25 for 7 days, $41 for 14 days, and $49 for 21 days, with full speed up to 2 GB per day and 1 Mbps after that. That is a lower daily cap than Airalo’s 3 GB, which matters if you stream.
Two caveats are worth knowing. The 20 GB and 50 GB plans connect only to KDDI au, while the smaller plans can use SoftBank as well.
The second caveat is price. The $16 and $23 prices were sale prices when we checked. At regular prices, 10 GB is $18 on both Nomad and Airalo, and Nomad’s 20 GB plan is $26 against Airalo’s $25.
Holafly sells only unlimited plans for Japan, priced by duration: 3 days is $11.90, 5 days is $20.50, 7 days is $27.50, 10 days is $36.50, 15 days is $50.50, and 30 days is $73.90. It runs on KDDI and SoftBank. You choose the exact number of days, and its plans run from 1 to 90 days, which suits a trip of 9 or 11 days better than a fixed 7-day or 15-day bucket.
Holafly’s page says operators may restrict speeds “for no more than one day” under a fair-use policy, but it does not publish a daily number, where Airalo states 3 GB and Nomad states 2 GB.
Hotspot sharing is capped at 1 GB per day, so a 7-day plan gives you 7 GB to share. It also costs more than Airalo at every duration, for example $27.50 against $26.50 for 7 days.
Ubigi’s plan pages list both KDDI and NTT Docomo as the Japan networks, which is the reason to consider it. Several independent guides describe NTT Docomo as the network with the widest rural reach in Japan, and Airalo, Nomad, and Holafly do not list it. Ubigi’s plans include 5 GB for 15 days at $10, 25 GB for 30 days at $32, and unlimited plans at $39 for 15 days and $65 for 30 days.
The 15-day unlimited plan gives 30 GB of full speed and then 2 Mbps. Data sharing is allowed, and the plan is data-only with no phone number.
The negative is price per GB for a short trip, since the cheapest plan we checked was 5 GB for $10. If you are staying in Tokyo, Kyoto, and Osaka, you are paying for coverage you will not use.
Reddit review aggregators are small samples, but they point the same way. A GummySearch roundup of Reddit comments scores Nomad 4.6 from 18 reviews, Airalo 4.5 from 73, Ubigi 4.3 from 29, and Holafly 4.3 from 22. One Ubigi reviewer wrote that 10 GB for 30 days “never felt slow” in Japan, and one Nomad user reported using it for Japan, Hong Kong, Taiwan, and China “with no issues.”
We could not find direct, recent Reddit threads with speed tests for these plans, so treat these as directional, not as benchmarks.
Check these before you buy
Your phone must be eSIM-capable and not carrier-locked. A carrier-locked phone will not accept a travel eSIM.
Install it before you fly. You can scan the QR code at home on Wi-Fi, then switch it on after landing.
Keep your home SIM for texts. Every plan here is data-only, so run your home line as a second SIM for bank codes. Our best eSIM for international travel guide covers multi-country trips if Japan is one stop on a longer route.
The decision
If you want one dependable plan for a normal trip, buy Airalo. 10 GB for 30 days is $18 on SoftBank and KDDI, with hotspot allowed.
If price per GB is the only thing that matters, buy Nomad. 10 GB is $16 on sale and 50 GB is $35, but full speed on unlimited stops at 2 GB per day.
If you stream heavily and want unlimited by the exact day, buy Holafly. A 7-day plan is $27.50, but expect a 1 GB per day hotspot limit and no published daily cap.
If your route leaves the cities, consider Ubigi. It is the one that lists NTT Docomo, at $32 for 25 GB over 30 days.
Airalo vs Holafly compared on real USD prices for Japan, Thailand, and Vietnam, daily data caps, hotspot rules, and who each eSIM is right for.
Verdict: Buy Airalo for most trips: it was cheaper than Holafly on every unlimited duration we checked in Japan, Thailand, and Vietnam, it sells fixed-GB plans that cost far less for light use, and it publishes its daily full-speed cap. Buy Holafly only if you want unlimited data sold by the exact day, from 1 to 90 days, and accept paying from $0.50 to about $25 more.
Airalo vs Saily compared on live prices, coverage, calls, apps, support, and Trustpilot scores, with a clear pick for each kind of trip.
Verdict: Airalo is the better default because its prices match Saily's almost to the cent and it adds calls and SMS plans, 3 to 365 day validity, and wider regional coverage. Saily is the better pick if you want a single reusable eSIM, faster in-app support, and a much higher Trustpilot score (4.7 against 4.1).
Anker power bank review for travelers: Laptop 25K 165W, Prime 26K 300W, MagGo 10K Slim and Nano 5K compared by weight, price, Wh, and the recall list.
Verdict: For most travelers carrying a laptop, the Anker Laptop Power Bank (25K, 165W) is the Anker to buy, because it pairs 92.5Wh of capacity with two built-in cables for $119.99. If you only charge an iPhone, buy the MagGo 10K Slim or the Nano 5K instead.
