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Saily
20 GB · 30 days
$24.99$1.25/GB
See this planBest 20 GB eSIM for Japan (2026)
If you already know you need about 20 GB, the question is who sells it for less and on which network. The lowest published price today is $24.00 with Airalo.
Updated September 24, 2026Prices checked September 24, 2026
We may earn a commission if you buy through our links, at no extra cost to you. It never changes the computed ranking. Affiliate disclosure
At a glance
Airalo
Unlimited · 7 days
$26.50
See this planAiralo
20 GB · 15 days
$24.00$1.20/GB
See this planPlans compared for this trip
Plan shown: the cheapest plan of each provider that covers at least 1 day and 20 GB. Tap a column header to sort.
| Provider | Data | Validity | Price | Price/GB | Japanese network | 5G | Hotspot | Score | CTA |
|---|---|---|---|---|---|---|---|---|---|
| Saily | 20 GB | 30 days | $24.99 | $1.25/GB | KDDI/SoftBank | Yes | Yes | 9.6 | View plan |
| Airalo | 20 GB | 15 days | $24.00 | $1.20/GB | SoftBank/KDDI | Yes | Not stated | 9.3 | View plan |
| Holafly | Unlimited | 7 days | $27.50 | — | KDDI/SoftBank | Yes | Yes | 9.1 | View plan |
| Yesim | Unlimited | 7 days | $29.40 | — | KDDI | Yes | Yes | 8.4 | View plan |
| Drimsim | 20 GB | Pay as you go | $245.11 | $12.26/GB | Not published | Not stated | Not stated | 3.0 | View plan |
Detailed ranking
- 1
Saily
Plan for this page: 20 GB · 30 days
9.6/10- Price
- $24.99
- Price/GB
- $1.25/GB
- Networks
- KDDI, SoftBank
- Hotspot
- Yes
Pros
- Unlimited plan available for Japan
- Hotspot allowed
- Two or more Japanese networks published
Cons
- Data only, no phone number
- 2
Airalo
Plan for this page: 20 GB · 15 days
9.3/10- Price
- $24.00
- Price/GB
- $1.20/GB
- Networks
- SoftBank, KDDI
- Hotspot
- Not stated
Pros
- Lowest price on this page
- Lowest price per GB on this page
- Unlimited plan available for Japan
Cons
- Data only, no phone number
- Hotspot policy not stated
- 3
Holafly
Plan for this page: Unlimited · 7 days
9.1/10- Price
- $27.50
- Price/GB
- —
- Networks
- KDDI, SoftBank
- Hotspot
- Yes
Pros
- Unlimited plan available for Japan
- Hotspot allowed
- Two or more Japanese networks published
Cons
- Data only, no phone number
- 4
Yesim
Plan for this page: Unlimited · 7 days
8.4/10- Price
- $29.40
- Price/GB
- —
- Networks
- KDDI
- Hotspot
- Yes
Pros
- Unlimited plan available for Japan
- Hotspot allowed
- 5G announced
Cons
- Data only, no phone number
- 5
Drimsim
Plan for this page: 20 GB · Pay as you go
3.0/10- Price
- $245.11
- Price/GB
- $12.26/GB
- Networks
- Not published
- Hotspot
- Not stated
Pros
- Wide choice of plan sizes
- Dedicated app
Cons
- No unlimited plan for Japan
- Pricier than the page average
What matters here
20 GB is a good fit for a long trip, a heavy user or two people sharing one connection. With this site’s assumptions a light user needs about 0.3 GB a day and a medium user about 0.8 GB, so divide 20 by your daily use to see how long it lasts.
The plan shown for each provider is the cheapest one with at least that volume. It may carry a little more data than you asked for, or last longer than your trip: the price is what we compare.
When no fixed plan of that size is published, an unlimited plan lasting at least a week can be the cheapest way to get the volume, which is why unlimited plans also appear in the table.
Before paying, check that your phone is unlocked and eSIM-compatible, and whether the plan allows hotspot sharing if you need it.
Guides on this site
How much data do you need?
Pick your trip length and how you use your phone. The assumptions are visible and editable.
Install your eSIM in 4 steps
- 1
Buy the plan before you leave and keep the QR code or the app handy.
- 2
Install the eSIM at home on Wi-Fi. Most plans only start the validity period once the eSIM connects in Japan.
- 3
On landing, switch the eSIM on for mobile data and keep your home SIM for calls and texts if you need them.
- 4
Turn on data roaming for the eSIM line, then check that the phone shows a Japanese network.
Your phone must be carrier-unlocked and eSIM-compatible. Check this in your phone settings before you buy.
Frequently asked questions
How long does 20 GB last in Japan?
With this site’s assumptions, a light user uses about 0.3 GB a day and a medium user about 0.8 GB. Divide 20 by your daily use, or try the estimator on this page.
What is the cheapest 20 GB eSIM for Japan?
The cheapest published plan with at least 20 GB is Airalo at $24.00. Prices were checked on September 24, 2026.
Is 20 GB enough for Japan?
It is enough for a long trip, a heavy user or two people sharing one connection. Heavy users who stream or share a hotspot should compare with the unlimited plans.
Can I share the eSIM data with another device?
Some providers allow hotspot sharing and some limit or do not mention it. The table above shows what each provider publishes; when it says “Not stated”, check the plan page before you rely on tethering.
When should I install the eSIM?
Install it at home on Wi-Fi a day or two before you fly, then switch it on for mobile data when you land. With most providers the validity only starts once the eSIM connects to a Japanese network.
Is a pocket Wi-Fi better than an eSIM?
A pocket Wi-Fi shares one connection with several devices but must be collected, charged and returned. An eSIM lives in your phone, so there is nothing to carry or give back.
How we rank
We compare the plans each provider publishes for Japan. We do not rank on personal testing or user reviews. For each provider we take the cheapest plan that covers the need of this page, then compute a score out of 10:
- Price (50%): cheapest plan on the page ÷ this plan’s price × 10.
- Japanese network (20%): 10 if two or more networks are published, 8 for one, 5 if unknown.
- Hotspot (15%): 10 if tethering is allowed, 0 if not, 5 if unknown.
- Options (15%): app, top-up and an unlimited plan for Japan (10 each if yes, 0 if no, 5 if unknown).
At equal score, providers we have a partner link with are listed first. Prices change often, so check the final price on the provider’s site.
Top pickSaily · $24.99See this plan