Asia
Prices checked Sep 30, 2026
aloSIM Japan eSIM Plans & Prices (2026)
aloSIM's complete Japan lineup — 32 plans, benchmarked against all 10 providers and 211 plans we track for this country.
Prices shown are aloSIM's own list prices as checked on Sep 30, 2026 and can change at any time — confirm the current figure on aloSIM's website before you buy.
aloSIM promo code
15% off every plan — code
ESIMTWEAKS
No expiry published. Applies at aloSIM checkout on top of the prices below.
The verdict, computed
Is aloSIM the right eSIM for Japan
aloSIM's best rate in Japan is $0.55/GB — the best of all 10 providers we track here. Entry price is $3.50 against the country floor of $1.99. The full ranking context lives in the all-provider Japan comparison.
aloSIM in Japan
All 32 aloSIM Japan plans
32 plans · 7 trip lengths · 1 to 30 days
| Plan | Data | Validity | Price | $/day | $/GB | Link |
|---|---|---|---|---|---|---|
| 50GB / 10 Days Best $/GB | 50GB | 10 days | $27.50 | $2.75 | $0.55 | View plan |
| 50GB / 15 Days | 50GB | 15 days | $30.00 | $2.00 | $0.60 | View plan |
| 50GB / 30 Days | 50GB | 30 days | $34.50 | $1.15 | $0.69 | View plan |
| 20GB / 7 Days | 20GB | 7 days | $22.00 | $3.14 | $1.10 | View plan |
| 20GB / 10 Days | 20GB | 10 days | $23.00 | $2.30 | $1.15 | View plan |
| 20GB / 15 Days | 20GB | 15 days | $24.00 | $1.60 | $1.20 | View plan |
| 20GB / 30 Days | 20GB | 30 days | $25.00 | $0.83 | $1.25 | View plan |
| 5GB / 3 Days | 5GB | 3 days | $7.00 | $2.33 | $1.40 | View plan |
| 5GB / 5 Days | 5GB | 5 days | $7.00 | $1.40 | $1.40 | View plan |
| 3GB / 1 Day | 3GB | 1 days | $4.50 | $4.50 | $1.50 | View plan |
| 10GB / 5 Days | 10GB | 5 days | $15.00 | $3.00 | $1.50 | View plan |
| 3GB / 1 Day | 3GB | 1 days | $5.00 | $5.00 | $1.67 | View plan |
| 10GB / 7 Days | 10GB | 7 days | $17.00 | $2.43 | $1.70 | View plan |
| 10GB / 10 Days | 10GB | 10 days | $17.50 | $1.75 | $1.75 | View plan |
| 10GB / 30 Days | 10GB | 30 days | $18.00 | $0.60 | $1.80 | View plan |
| 10GB / 15 Days | 10GB | 15 days | $18.00 | $1.20 | $1.80 | View plan |
| 5GB / 7 Days | 5GB | 7 days | $9.50 | $1.36 | $1.90 | View plan |
| 5GB / 10 Days | 5GB | 10 days | $10.00 | $1.00 | $2.00 | View plan |
| 5GB / 15 Days | 5GB | 15 days | $10.50 | $0.70 | $2.10 | View plan |
| 5GB / 30 Days | 5GB | 30 days | $11.00 | $0.37 | $2.20 | View plan |
| 3GB / 30 Days | 3GB | 30 days | $8.00 | $0.27 | $2.67 | View plan |
| 2GB / 15 Days | 2GB | 15 days | $6.50 | $0.43 | $3.25 | View plan |
| 1GB / 1 Day | 1GB | 1 days | $3.50 | $3.50 | $3.50 | View plan |
| 1GB / 3 Days | 1GB | 3 days | $4.00 | $1.33 | $4.00 | View plan |
| 1GB / 7 Days | 1GB | 7 days | $4.50 | $0.64 | $4.50 | View plan |
| 1GB / 5 Days | 1GB | 5 days | $4.50 | $0.90 | $4.50 | View plan |
| Unlimited / 3 Days | Unlimited | 3 days | $11.50 | $3.83 | — | View plan |
| Unlimited / 5 Days | Unlimited | 5 days | $19.50 | $3.90 | — | View plan |
| Unlimited / 7 Days | Unlimited | 7 days | $27.00 | $3.86 | — | View plan |
| Unlimited / 10 Days | Unlimited | 10 days | $35.00 | $3.50 | — | View plan |
| Unlimited / 15 Days | Unlimited | 15 days | $49.00 | $3.27 | — | View plan |
| Unlimited / 30 Days | Unlimited | 30 days | $74.00 | $2.47 | — | View plan |
Prices in USD as listed by aloSIM, excluding promo codes and taxes. Badges compare against all 211 Japan eSIM plans we track — see our methodology. Last checked Sep 30, 2026.
Beyond the price tag
aloSIM Japan eSIM hotspot 5G and fair-use rules
Quoted from aloSIM's own published policy rather than paraphrased — these are the terms that decide whether a plan for Japan survives a real trip.
Hotspot and tethering
AllowedFrom the plan allowance
Tethering is permitted and shares the same data pool as the phone, with no separate hotspot tier.
Speed and 5G
5G available15–300 Mbps
Typical real-world download on the fastest host network, NTT Docomo. Actual speed depends on which mast your phone picks and how busy it is.
Fair-use threshold
1.5 - 2 GB/day on unlimited plans
Drops to 512 Kbps
aloSIM's unlimited tiers slow to roughly 512 Kbps once the daily full-speed allowance is used. Its metered packs behave like hard-capped data and are not throttled.
Top-ups
AvailableFlexible top-ups through the free aloSIM app.
Fine print decoded
Is aloSIM unlimited data in Japan really unlimited
| Plan | Price | $/day | Fair-use policy |
|---|---|---|---|
| Unlimited / 3 Days | $11.50 | $3.83 | 3 GB per day at full speed, then ∞ at 1kbps |
| Unlimited / 5 Days | $19.50 | $3.90 | 3 GB per day at full speed, then ∞ at 1kbps |
| Unlimited / 7 Days | $27.00 | $3.86 | 3 GB per day at full speed, then ∞ at 1kbps |
| Unlimited / 10 Days | $35.00 | $3.50 | 3 GB per day at full speed, then ∞ at 1kbps |
| Unlimited / 15 Days | $49.00 | $3.27 | 3 GB per day at full speed, then ∞ at 1kbps |
| Unlimited / 30 Days | $74.00 | $2.47 | 3 GB per day at full speed, then ∞ at 1kbps |
The masts behind the plan
Which network does aloSIM ride in Japan
aloSIM owns no towers in Japan. This plan connects to the local host carriers KDDI, NTT Docomo, SoftBank — so coverage, speed and rural reach follow those masts rather than the brand on the voucher.
NTT Docomo
5G25–300 Mbps
Japan's gold standard for coverage — mountain passes, rural islands, basement floors. If your route leaves the cities, prefer a Docomo-based plan.
SoftBank
5G15–250 Mbps
Excellent in cities and on major tourist corridors, with 5G around big stations. Rural reach is good but a step behind Docomo.
KDDI
5G20–250 Mbps
Strong nationwide, with a particularly good grip on western Japan and coastal routes. City speeds rival Docomo.
Network-by-network breakdown, including which carriers every rival rides and how the two testers rank them: Japan carrier breakdown →
Typical speeds are our editors' reads of each operator's own coverage data. The independent national benchmark is Ookla's Speedtest Global Index for Japan.
Before you buy
Things to know about Japan before you pick a plan
Country-level facts, not brand claims — they apply to any eSIM you buy for Japan, aloSIM's included.
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Japanese law requires passport verification for local prepaid SIM cards (SoftBank, Docomo, KDDI) - travel eSIMs bypass this entirely.
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SoftBank's own tourist SIM can only be activated 09:00-21:00 JST; travel eSIMs activate 24/7, which matters for late-night arrivals at Narita or Haneda.
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Pocket WiFi rental is Japan's classic connectivity option. It wins for groups of 3 or more, but a solo traveler almost always pays less with an eSIM.
Price by trip length
What aloSIM costs by trip length in Japan
The same trip priced two ways — aloSIM's own cheapest plan that stays valid for the whole stay, against the cheapest rival plan covering the same days in Japan.
| Trip length | aloSIM cheapest | Cheapest rival in Japan | cheaper |
|---|---|---|---|
| 3 days | $4.00 3 days · 1GB | $1.99 3 days · 1GB · Roami | Roami cheaper |
| 5 days | $4.50 7 days · 1GB | $1.99 7 days · 1GB · Roami | Roami cheaper |
| 7 days | $4.50 7 days · 1GB | $1.99 7 days · 1GB · Roami | Roami cheaper |
| 10 days | $6.50 15 days · 2GB | $3.00 14 days · 3GB · Roamic | Roamic cheaper |
| 15 days | $6.50 15 days · 2GB | $4.00 30 days · 1GB · Ubigi | Ubigi cheaper |
| 30 days | $8.00 30 days · 3GB | $4.00 30 days · 1GB · Ubigi | Ubigi cheaper |
Pick your trip length and this re-reads the plan table above on the spot — the cheapest plan whose validity still covers the whole trip, against the cheapest rival in the same country.
Price it for your own dates
aloSIM cheapest plan that covers the trip
—
Cheapest rival —
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Only plans whose validity covers the whole trip are counted here, so a 30-day trip is priced with a 30-day plan rather than a 5-day one stacked up. Each pick shows its data allowance next to the price — a 500MB trial pack undercuts a 5GB plan for a reason.
One column per brand, cheapest plan that covers the whole trip. Rivals are the other providers we track in Japan.
Need an exact number for your own dates? Run the trip cost calculator.
Who it fits
Should you buy aloSIM for Japan
Buy it if
- +You would rather size your own data — 32 plans here, from $3.50.
- +You are travelling for 30 days or more — 3GB / 30 Days covers it for $8.00.
- +You are on a short break — 1GB / 1 Day runs 1 days for $3.50.
Look elsewhere if
- –You need a local phone number — these are data-only plans.
- –Cheapest headline price is all that matters — Roami's smallest plan in Japan starts at $1.99, and that buys 1GB.
Honest trade-offs
Where aloSIM wins and loses in Japan
Strengths
- +Unlimited data from $2.47 a day
- +Best $/GB in Japan — $0.55 against a $0.55 benchmark
- +Its daily rate falls from $3.50 on the 1-day plan to $0.27 on the 30-day plan
- +5G on all 3 host networks in Japan
- +One purchase covers trips from 1 to 30 days
- +Hotspot and tethering allowed — From the plan allowance
Watch out for
- –A 30-day unlimited plan costs $45.00 from Ubigi against $74.00 here
- –aloSIM sells 7 trip lengths here while Roamic sells 30
- –Fair-use throttling starts at about 2 GB a day, then speeds drop to 512 Kbps
- –Data-only plans with no local phone number
Brand history and track record — aloSIM
The other side by side
aloSIM vs the other providers in Japan
Airalo
from $4.00
Airalo ranks 7 of 10 on Japan cost per gigabyte — its cheapest plan is 1GB.
Pricier entry by $0.50
See all Airalo plans →
Holafly
from $11.90
Holafly sells unlimited Japan plans only — there is no $/GB figure to rank it on.
Pricier entry by $8.40
See all Holafly plans →
Jetpac
from $5.00
Jetpac ranks 5 of 10 on Japan cost per gigabyte — its cheapest plan is 3GB.
Pricier entry by $1.50
See all Jetpac plans →
Nomad
from $4.00
On cost per gigabyte, Nomad sits 3 of 10 in Japan, entering with 1GB.
Pricier entry by $0.50
See all Nomad plans →
Roami
from $1.99
Roami's Japan entry plan is 1GB, which puts it 4 of 10 on cost per gigabyte.
Cheaper entry by $1.51
See all Roami plans →
Roamic
from $2.00
Roamic ranks 2 of 10 on Japan cost per gigabyte — its cheapest plan is 1GB.
Cheaper entry by $1.50
See all Roamic plans →
Saily
from $3.99
On cost per gigabyte, Saily sits 9 of 10 in Japan, entering with 1GB.
Pricier entry by $0.49
See all Saily plans →
Ubigi
from $3.50
Ubigi's Japan entry plan is 1GB, which puts it 6 of 10 on cost per gigabyte.
Same entry price
See all Ubigi plans →
Yesim
from $3.97
Yesim ranks 8 of 10 on Japan cost per gigabyte — its cheapest plan is unlimited.
Pricier entry by $0.47
See all Yesim plans →
FAQ
aloSIM Japan eSIM questions
How much does aloSIM charge for Japan?
aloSIM sells 32 plans for Japan, from $3.50. Its best rate is $0.55/GB, drawn from the 10 provider price sheets we track for this destination. All prices are in USD as listed by aloSIM and exclude promo codes.
Is aloSIM unlimited data in Japan really unlimited?
Uncapped, but not unthrottled: aloSIM's Japan unlimited plans run on a published fair-use rule, and what we recorded from aloSIM's own documentation is 1.5 - 2 GB/day on unlimited plans. Past that point the connection slows instead of stopping, so the promise is about data volume rather than speed — see the fair-use table above for which tiers carry the rule and the policy cards for the quoted source. Maps, chat and some video rarely reach the threshold; a laptop on hotspot usually does.
Can I share my aloSIM Japan eSIM with a laptop?
Tethering is governed by aloSIM's own rule rather than by the country. What we recorded from aloSIM's documentation for Japan plans is From the plan allowance. That is the publisher's wording, not our paraphrase — the full quote sits in the policy cards above. If you work from a laptop for hours a day, treat this line as the deciding factor between aloSIM and a metered alternative, because hotspot traffic drains the same allowance as the phone itself.
Which network does aloSIM use in Japan?
aloSIM owns no towers in Japan, so your data rides the local host carriers — KDDI, NTT Docomo, SoftBank. The fastest of those sustains roughly 300 Mbps, and every one of the 211 Japan plans we track connects to the same local networks.
Is aloSIM or Roami the better Japan eSIM?
aloSIM's cheapest plan here is $3.50; Roami's is $1.99, though that entry price buys 1GB. The full ranking with every plan — allowance and $/GB side by side — sits in the Japan eSIM comparison.
Does aloSIM have good reviews for Japan?
We publish no star rating, and that is deliberate: Trustpilot runs separate regional storefronts, so the same brand holds several scores at once, and quoting one of them as the rating would mislead. The reviews themselves are at <a href="https://www.trustpilot.com/review/alosim.com" rel="nofollow noopener" target="_blank">aloSIM on Trustpilot</a>. What we verify instead is measured on this page — 32 aloSIM plans for Japan starting at $3.50.
Does aloSIM work in Japan?
Yes. aloSIM owns no towers in Japan, so your plan rides the local host networks — KDDI, NTT Docomo, SoftBank — and every one of the 211 Japan plans we track connects to that same set. Installs that fail are almost never a coverage problem. They come down to three causes: the handset is still carrier-locked, the eSIM line's data roaming is switched off, or the phone stays on the old line for mobile data after the profile installs. All three are fixable at home, which is why installing on your own Wi-Fi beats doing it at the airport. aloSIM sells 32 packages here from $3.50, so the host network is not what separates it from its rivals.
How do I activate my aloSIM eSIM for Japan?
Install it while you still have home Wi-Fi: aloSIM issues either a QR code or an in-app profile, and the install itself takes minutes. Leave the line switched off until you land if you want the validity window to start on arrival, and turn data roaming on for that line. On this page aloSIM sells 32 separate Japan packages, from $3.50 each, so match one to your trip length rather than planning to top up abroad. The generic walkthrough is in our eSIM installation guide.
See the whole Japan picture
aloSIM's best $/GB in Japan next to the other 10 providers we track — the full table with all 211 plans, badges and fair-use notes lives on the Japan eSIM comparison. Prices verified Sep 30, 2026.