3GB · 15 days
The smaller current allowance: consider it if maps, messaging and browsing are your main needs.
View this current planAsia · Travel data
Japan eSIM
Compare Japan travel data plans by allowance and validity. Check the selected plan’s networks and activation rule before buying.
- One-off prepaid price
- Secure card payment
- Activation rule before purchase
Choose your Japan data plan
Japan eSIMs: 3GB for 15 days from €4.49. 10GB for €8.99 over 30 days. Compare networks and activation before travelling.
Connect on NTT docomo, Rakuten Mobile, KDDI/au, SoftBank
- NTT docomo
- Rakuten Mobile
- KDDI/au
- SoftBank
01 · Before you buyWill it work on my phone?Check device compatibility and carrier locks.02 · Get connectedCan I set up before travelling?Validity starts on first connection to a supported destination network. You can install before travel.03 · Check your planDo I already have roaming?Check your exact existing plan before buying.
Plan details — 3GB
Japan 3GB
- Supported networks
- NTT docomo, Rakuten Mobile, KDDI/au, SoftBank
- Network generation
- Up to 5G
- Plan type
- Mobile data plan.
- Set up before you travel
- Validity starts on first connection to a supported destination network. You can install before travel.
Plan details — 10GB
Japan 10GB
- Supported networks
- NTT docomo, Rakuten Mobile, KDDI/au, SoftBank
- Network generation
- Up to 5G
- Plan type
- Mobile data plan.
- Set up before you travel
- Validity starts on first connection to a supported destination network. You can install before travel.
Plan details — 20GB
Japan 20GB
- Supported networks
- NTT docomo, Rakuten Mobile, KDDI/au, SoftBank
- Network generation
- Up to 5G
- Plan type
- Mobile data plan.
- Set up before you travel
- Validity starts on first connection to a supported destination network. You can install before travel.
Which Japan eSIM plan suits my trip?
These are relative allowance bands from the current plans, not measured consumption estimates. Choose enough data and days for your trip.
10GB · 30 days
A middle allowance to compare for mixed everyday use. Your trip length and usage still matter.
View this current plan20GB · 30 days
The larger current allowance: compare it if your own usage estimate is higher. Check hotspot support separately.
View this current planWhat does this eSIM include?
Compare each option below with the matching plan above. A mobile-data label does not confirm calls, texts, a local number or tethering.
Japan 3GB
- Allowance / validity
- 3GB / 15 days
- Current price
- €4.49
- Set up before you travel
- Validity starts on first connection to a supported destination network. You can install before travel.
- Supported networks
- NTT docomo, Rakuten Mobile, KDDI/au, SoftBank
- Calls / SMS
- Unknown — confirm before buying
- Local phone number
- Unknown — confirm before buying
- Hotspot / tethering
- Unknown — confirm before buying
Japan 10GB
- Allowance / validity
- 10GB / 30 days
- Current price
- €8.99
- Set up before you travel
- Validity starts on first connection to a supported destination network. You can install before travel.
- Supported networks
- NTT docomo, Rakuten Mobile, KDDI/au, SoftBank
- Calls / SMS
- Unknown — confirm before buying
- Local phone number
- Unknown — confirm before buying
- Hotspot / tethering
- Unknown — confirm before buying
Japan 20GB
- Allowance / validity
- 20GB / 30 days
- Current price
- €15.49
- Set up before you travel
- Validity starts on first connection to a supported destination network. You can install before travel.
- Supported networks
- NTT docomo, Rakuten Mobile, KDDI/au, SoftBank
- Calls / SMS
- Unknown — confirm before buying
- Local phone number
- Unknown — confirm before buying
- Hotspot / tethering
- Unknown — confirm before buying
Before you buy
Check that your phone supports eSIM, estimate your own data use and read the selected plan’s activation rule. Product facts above come from the current available catalogue; checkout verifies the final price.
Estimate Japan data for one phone
Estimate for one phone, then compare both data and validity. Start with your own usage; the example minutes below are editable assumptions, not measured demand.
Adjust daily activity minutes
Illustrative estimate: 6.4GB per phone, including the calculator’s 15% buffer. Actual use varies with apps, quality settings and Wi-Fi.
Check your existing roaming before buying
Your current mobile plan may already meet your needs. Check its Japan allowance, charges and conditions. Compare those with the selected plan’s activation rule and supported networks; a country label is not a coverage guarantee.
Indicative price context
5GB over 7 daysIndicative Irish roaming benchmark
Irish mobile roaming~€28Observed provider range: €20–€35
suitcase.ieClosest available: 10GB eSIMFrom €8.99 · valid for 30 days
Potential saving~€19Like-for-like data and validity threshold met.
Supplier-backed network information
Mobile coverage in Japan
Eastern Asia · Asia
Networks and technology
suitcase.ie’s current Japan catalogue identifies 4 supported networks. Current supplier data lists NTT docomo, Rakuten Mobile, KDDI/au and SoftBank. Available plans identify Up to 5G. Japan is grouped in Eastern Asia by the cited official geography source.
- NTT docomo
- 5G
- Rakuten Mobile
- 5G
- KDDI/au
- 5G
- SoftBank
- 5G
Where coverage can vary
No destination-specific geographic limitation is published without a verified source. As with all mobile services, signal strength varies by location, network conditions and device.
Actual service depends on the selected plan, location, network conditions, congestion and device. Supplier-listed technology describes supported access, not guaranteed speed or nationwide coverage.
Connectivity information last reviewed: September 2026. Geographic classification: United Nations Statistics Division.
Practical trip use
Using mobile data in Japan
For travel in Japan, part of Eastern Asia, current plans provide 3–20GB of data for 15–30 days. Use it for maps, messaging, translation, transport information and digital travel bookings; actual consumption depends on the apps and settings used. Validity starts on first connection to a supported destination network. You can install before travel. A compatible dual-SIM phone can keep the existing SIM active while suitcase.ie is selected for mobile data.
- Higher-allowance options for data-intensive use
- Plan choice based on trip length and allowance
- Supplier-listed network options that can differ by plan
Practical connectivity guidance
Mobile data in Japan: what to expect.
Direct answer
A suitcase.ie Japan eSIM gives you mobile data on supported local networks without replacing your physical SIM. There are currently 3 purchasable options, with prices, allowances, validity and activation rules shown on this page.
Japan eSIM FAQs
Frequently asked questions about eSIMs in Japan
Which mobile networks can the Japan eSIM use?
Current suitcase.ie Japan plans list NTT docomo, Rakuten Mobile, KDDI/au and SoftBank. The network available depends on the selected plan, location and local conditions.
Does the Japan eSIM support 4G or 5G?
Current supplier data identifies Up to 5G across the available Japan plans. This is a plan capability, not a guarantee of coverage or speed at every location.
Which Japan plan is closest to 5GB for seven days?
The closest current option to 5GB for seven days is 10GB valid for 30 days at €8.99. Choose by the allowance and validity shown in the live plan table.
When does the Japan eSIM activate?
Validity starts on first connection to a supported destination network. You can install before travel.
How does Irish roaming compare for Japan?
The current Japan benchmark averages valid published rates from 2 Irish operators for 5GB over seven days. The dated provider observations and methodology are shown on this page.
Before you buy
Get your phone ready for travel.
Coverage and network generation vary by location and device. Keep offline directions for your first journey as a practical backup.
Check your phone and return to this plan →Validity starts on first connection to a supported destination network. You can install before travel.
Supported networks may include NTT docomo, Rakuten Mobile, KDDI/au. Local coverage and speed vary.
See your selected plan’s one-off price above. Checkout verifies it again before payment.
Travel tools
Prepare your trip with an editable budget and packing checklist.
Not sure on allowance?
Estimate the data you’ll use.
Turn trip length and everyday phone habits into a transparent estimate, then return to suitable Japan plans.
Use the calculatorNeed to check the device?
Confirm eSIM support.
Search verified device records and confirm that your phone is network unlocked before purchase.
Check compatibilityBeyond connectivity
Getting ready for Japan
Start with the country, then add your dates and area for more precise weather, packing and things to do.
Weather
Choose your area for a useful local forecast.
Pack
Comfortable walking kit
Popular planning areas
Tokyo · Osaka / Kyoto · Hokkaido
Keep exploring
