eSIM · bundle referenceUsed in this estimate
Saily Japan eSIM
US$3.99–24.99
- 1–20GB bundles
- 7- or 30-day validity
- Hotspot supported; verify current terms
Free Japan connectivity estimator
Compare ways to keep your Japan travel group connected.
Estimate compatible eSIM, pocket WiFi and hybrid setups for the whole group—then see exactly what the math assumes.
✓Compatible setups only✓Transparent price math✓No signup
01 · Your trip
Build your connection plan
Results update instantly.
Quick starts
Travelers
People who need data
Total trip length
Travelers leaving the group
One subgroup that may separate
Days apart
Days that subgroup needs its own connection
Unlocked, eSIM-ready phones
Across the whole group
eSIM-ready phones in subgroup
Among travelers who separate
Per traveler, per day
Used for guidance, not price
01
Feasibility firstIncompatible setups are excluded.
02
Split-group logicTwo connections are counted when you separate.
03
Visible assumptionsCapacity, validity and unit prices are shown.
Pricing references used
The result points to the products behind the estimate.
These are representative public-price snapshots, not a complete market search. Confirm the final checkout total and network before buying.
Pocket WiFi · daily reference
NINJA WiFi K4
¥440–1,100 / day
- Shared connection for multiple devices
- Airport pickup options
- Check data cap, insurance and return terms
Saily USD prices are converted at ¥160/US$1. Pocket WiFi uses representative NINJA WiFi daily rates. Checked July 11, 2026; prices may change.
What the estimate includes
Know what is—and is not—in the number.
We select the lowest-cost eSIM bundle combination whose validity and estimated capacity cover the trip, then compare it with daily pocket WiFi tiers.
eSIM bundles: 1GB/7 days ¥640; 3GB ¥1,280; 5GB ¥1,760; 10GB ¥2,880; 20GB ¥4,000 (30 days except 1GB).
Pocket WiFi: light ¥440/day; regular ¥770/day; heavy ¥1,100/day, per router.
Included: data plan price and the number of connections needed when the group separates.
Not included: tax differences, shipping, pickup/return, insurance, voice/SMS, throttling and coverage.
Quick device check
Count a phone as eSIM-ready only when both conditions are true: it supports eSIM and is unlocked by the carrier.
- Confirm eSIM support for the exact phone model
- Confirm the phone is carrier-unlocked
- Check hotspot and fair-use rules
- Check the underlying Japanese mobile network
Our method
A planning estimate, not a universal cheapest-price claim.
The calculator estimates a daily data need, selects valid eSIM bundles, and compares only setups that can keep both subgroups connected. A second pocket WiFi is counted when separate travelers cannot all use eSIM.
Coverage, congestion, phone compatibility and provider terms can outweigh price. Always confirm those details on the official checkout page.
Quick answers
Before you buy
Is pocket WiFi always cheaper for a family?
No. Group size, trip length, data use and days apart all change the result.
Can one eSIM be shared by hotspot?
Many plans allow it, but limits vary. The host phone must stay nearby and its battery drains faster.
Does this calculator guarantee coverage?
No. Coverage depends on the Japanese network, route, congestion and device compatibility.
How does this site make money?
Some links may be affiliate links. A commission would not change the estimate or increase your price.