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Japan eSIM Cost per GB at Each Data Size (Oct 2026)
HelloRoam is the top pick for Japan, selling 1 GB for 7 days at $3.49, under Saily's $3.99 for 1 GB over 7 days in the 30 Oct 2026 price check. HelloRoam offers a website and app in 63 languages. Airalo covers 200+ destinations, against the 185 that HelloRoam sells.
Plan snapshot
- Lowest cost per GB: 50 GB, 30 days, $30.60 ($0.61/GB).
- Cheapest of all five on 30 Oct 2026: 3, 5, 10 and 20 GB for 30 days; 1 GB for 7 days.
- Cheapest of those selling on 30 Oct 2026: 50 GB, 30 days (no Airalo or Saily 50 GB plan).
- Cheapest unlimited of those selling on 30 Oct 2026: 7 days, $19.71; 15 days, $38.40; 30 days, $65.28, with 2 GB a day at full speed.
- Narrow wins on 30 Oct 2026: 10 GB, 30 days, $15.99 against Nomad's $16.00; 20 GB, 30 days, $22.49 against Nomad's $23.00.
- All 6 Japan plans allow hotspot and top-ups, per the plan list of 7 Sep 2026.
- A HelloRoam eSIM in Japan attaches to KDDI/au, NTT docomo, Rakuten Mobile and SoftBank, 4 host operators in all.
NTT docomo 4G · hotspot and top-ups (plan list, 7 Sep 2026)
What does each Japan data size cost?
HelloRoam 50 GB for 30 days at $0.61 per GB, read 29 Oct 2026. Rival plans keep their own row, and a rival that sold for less prints both prices.
| Provider | 1 GB | 3 GB | 5 GB | 10 GB | 20 GB | 50 GB |
|---|---|---|---|---|---|---|
| HelloRoam 1 GB: $3.49, 7 days; 3 GB: $6.99, 30 days; 5 GB: $9.49, 30 days; 10 GB: $15.99, 30 days; 20 GB: $22.49, 30 days; 50 GB: $30.60, 30 days | $3.497 days | $6.9930 days | $9.4930 days | $15.9930 days | $22.4930 days | $30.6030 days |
| Holafly unlimited only, no fixed plans | Unlimited only, no fixed plans | |||||
| Nomad 1 GB: $4.00, 7 days; 3 GB: $7.00, 30 days; 5 GB: $10.00, 30 days; 10 GB: $16.00, 30 days; 20 GB: $23.00, 30 days; 50 GB: $35.00, 30 days | $4.007 days | $7.0030 days | $10.0030 days | $16.0030 days | $23.0030 days | $35.0030 days |
| Airalo 1 GB: $4.00, 3 days; 3 GB: $8.00, 7 days; 5 GB: $11.00, 30 days; 10 GB: $18.00, 30 days; 20 GB: $25.00, 30 days; 50 GB: No 50 GB plan | $4.003 days | $8.007 days | $11.0030 days | $18.0030 days | $25.0030 days | No 50 GB plan |
| Saily 1 GB: $3.99, 7 days; 3 GB: $7.99, 30 days; 5 GB: $10.99, 30 days; 10 GB: $17.99, 30 days; 20 GB: $24.99, 30 days; 50 GB: No 50 GB plan | $3.997 days | $7.9930 days | $10.9930 days | $17.9930 days | $24.9930 days | No 50 GB plan |
Which Japan plans have the lowest cost per GB?
Top 5 plans by cost per GB
| # | $/GB ↑ | Plan | Total | Network | Days | Action |
|---|---|---|---|---|---|---|
| 1 | $0.61Lowest $/GB | 50GB | $30.60 | NTT docomo | 30d | Get this plan → |
| 2 | $1.12 | 20GB | $22.49 | KDDI/au | 30d | Get this plan → |
| 3 | $1.60 | 10GB | $15.99 | KDDI/au | 30d | Get this plan → |
| 4 | $1.90 | 5GB | $9.49 | KDDI/au | 30d | Get this plan → |
| 5 | $2.33 | 3GB | $6.99 | KDDI/au | 30d | Get this plan → |
How do the five providers compare in Japan?
The first row has the top rubric score, 9.0 out of 10 on the method of 30 Oct 2026. 4 of the five have a Japan rate here, and the first row lists the lowest at $0.61/GB.
| Provider | Score | Lowest $/GB here | Cheaper plans here | Destinations | Min-max GB | Min-max validity | Hotspot | Devices |
|---|---|---|---|---|---|---|---|---|
1. HelloRoam Cheapest in the most price cells | 9.0/10 | $0.61 50 GB / 30 days at $30.60 | Rows below list any rival plan sold for less | 185 | 1-50 GB | 7-30 days | Yes, all plans | iPhone XR+, Android 2020+ |
2. Holafly Joint longest refund window | 6.3/10 | Unlimited only from $27.50 for 7 days, read 30 Oct 2026 | None found | 200+ | Not published | Not published | Limited, some countries | iPhone XR+, Android 2020+ |
3. Nomad Second on price cells won | 5.9/10 | $0.70 50 GB / 30 days at $35.00, read 30 Oct 2026 | None found | 200 | 1-50 GB | 7-30 days | Not on all plans | iPhone XR+, Android 2020+ |
4. Airalo Joint first on the coverage score | 5.5/10 | $1.25 20 GB / 30 days at $25.00, read 30 Oct 2026 | None found | 200+ | 1-20 GB | 3-30 days | Yes, metered plans only | iPhone XR+, Android 2020+ |
5. Saily Joint second-widest plan mix | 4.0/10 | $1.25 20 GB / 30 days at $24.99, read 30 Oct 2026 | None found | Not stated | 1-20 GB | 7-30 days | Yes, most plans | iPhone XR+, Android 2020+ |
First-row rates come from that provider's catalogue, read 29 Oct 2026. Rival rates read on each provider's own site on 30 Oct 2026.
- HelloRoam · Cheapest in the most price cells · Cheapest of all five in 207 of 367 price cells read 30 Oct 2026.
- Holafly · Joint longest refund window · 180 days on an unactivated eSIM, level with the top pick.
- Nomad · Second on price cells won · Cheapest of all five in 95 of 367 price cells read 30 Oct 2026.
- Airalo · Joint first on the coverage score · 200+ destinations, level with Holafly.
- Saily · Joint second-widest plan mix · Fixed plans in 42 and unlimited plans in 40 of the 42 destinations checked, level with Airalo.
The order is the rubric on the research method page, not a price sort. Not published means no price for Japan was read for that provider. No coverage means the provider does not sell that destination. No cell is filled with an estimate.
Every plan in this index is data only, with no local phone number. All of them need an eSIM-capable handset, which means iPhone XR or newer and most Android phones from 2020.
Per-GB rates ranked, lowest first
Provider-by-Provider $/GB Rates
Only one provider (HelloRoam) covers Japan. The lowest plan is 1GB at $3.49/GB.
Price Spread Analysis
Japan has 6 eSIM plans from 1 provider, ranging from $0.61/GB to $3.49/GB. Median per-GB across all 6 plans is $1.75/GB. The per-GB spread is $2.88, meaning the priciest plan costs 470% more per gigabyte than the cheapest.
Which Japan plan costs the least per day?
Value Per Day Breakdown
| Plan | Total | Days | $/Day |
|---|---|---|---|
| 1GB | $3.49 | 7 | $0.50 |
Airport SIM vs eSIM Savings
Airport SIM kiosks at Japan charge $20-50 for 5-15GB / 7-30 days for tourist data plans. Bic Camera and NINJA WiFi and Sakura Mobile operate the airport kiosks. Local prepaid SIMs are available for $15-30 for 3GB / 30 days — requiring a physical store visit and, in some cases, passport registration. An eSIM from $3.49 activates before you land and skips the queue.
Use-Case Value Picks
Plans by trip length for Japan: Weekend (2-3 days): 3 GB at $6.99 for 30 days. Week trip (7 days): 5 GB at $9.49 for 30 days. Two-week vacation: 10 GB at $15.99 for 30 days. Digital nomad (30 days): 20 GB at $22.49 for 30 days.
Which Japan plan of 3 GB or more has the lowest cost per GB?
HelloRoam's 50GB plan at $30.60 delivers the strongest price-to-data ratio for Japan. At $0.61/GB for 50GB over 30 days, the daily cost is $1.02. HelloRoam's plan includes tethering included and top-up available at no extra cost. This plan connects through NTT docomo in Japan. 1 provider competes for Japan across 6 plans. The per-GB spread from cheapest to most expensive is $0.61 to $3.49.
Value Rankings
| # | Plan | Score | $/GB | $/Day |
|---|---|---|---|---|
| 1 | 50GB | 95 | $0.61 | $1.02 |
| 2 | 20GB | 84 | $1.12 | $0.75 |
| 3 | 10GB | 74 | $1.60 | $0.53 |
| 4 | 5GB | 68 | $1.90 | $0.32 |
| 5 | 3GB | 54 | $2.33 | $0.23 |
How does Japan pricing change by data size?
Japan eSIM pricing varies significantly by data tier. The right plan depends on trip length and daily usage intensity. 1GB: HelloRoam leads at $3.49 ($3.49/GB, 1GB, 7 days). This tier suits maps, messaging, and basic browsing for 2-3 days. Top-up is available if you underestimate your needs. 3GB: HelloRoam leads at $6.99 ($2.33/GB, 3GB, 30 days). This tier suits maps, social media, and messaging for a 5-7 day trip. Top-up is available if you underestimate your needs. 5GB: HelloRoam leads at $9.49 ($1.90/GB, 5GB, 30 days). This tier suits active social media use and photo uploads for a week. 10GB: HelloRoam leads at $15.99 ($1.60/GB, 10GB, 30 days). This tier suits streaming, video calls, and heavy browsing for 7-14 days. 20GB: HelloRoam leads at $22.49 ($1.12/GB, 20GB, 30 days). This tier suits digital nomad work, daily streaming, and tethering for 2-4 weeks. Per-GB rates drop with plan size: $3.49/GB at 1GB vs $1.60/GB at 10GB. Buying larger saves 54% per gigabyte.
How do I pay the least for Japan?
HelloRoam's 50GB plan at $30.60, the lowest cost per GB for Japan, saves $53.40 against a week on AT&T's International Day Pass at $12 a day. An airport SIM at $20-50 for 5-15GB / 7-30 days costs less up front. HelloRoam starts at $3.49 for 1GB. Either way there is no kiosk queue, no passport scan and no wait to activate. Read 29 Oct 2026.
How to Get the Lowest Price
Buy the smallest plan that covers your trip length and data needs. HelloRoam's 50GB plan at $30.60 is the lowest-cost entry point for Japan. 6 of 6 plans support top-up if you run out.
WiFi Strategy for Japan
WiFi availability in Japan is excellent. Free WiFi at stations, convenience stores, and most cafes; Japan WiFi auto-connect app available Use WiFi for large downloads and video calls to stretch your eSIM data further.
Peak Season Pricing
Peak travel season for Japan: Mar-Apr and Oct-Nov. Cherry blossom season (late March-early April) and autumn foliage (October-November) draw peak crowds eSIM prices generally remain stable during peak season, unlike airport SIM kiosks which may charge more.
Hidden Costs to Watch
Watch for: (1) Tethering restrictions — 6 of 6 plans include hotspot. (2) Tax and checkout fees — some providers add VAT at checkout. (3) Data cap overages — plans stop or slow down once the cap is spent, and no provider tracked here publishes the speed it applies. (4) Activation timing — some plans start counting validity from purchase, not first use. Always check the provider's terms before buying.
Which networks cover Japan?
Carrier Infrastructure
Japan's primary carriers are NTT docomo and KDDI/au and SoftBank and Rakuten Mobile.
5G Status
5G coverage in Japan is widespread across major cities and most tourist areas.
How much is an unlimited eSIM for Japan?
| Duration | Per day | Total | Discount |
|---|---|---|---|
1 day | $3.20/day | $3.20 | none |
3 days | $3.04/day | $9.12 | 5% off |
7 days | $2.82/day | $19.71 | 12% off |
15 days | $2.56/day | $38.40 | 20% off |
30 days | $2.18/day | $65.28 | 32% off |
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