Pay 
Language 
Currency 
No results found
SIMBA Japan roaming: Coverage, price, and how to activate
Compare SIMBA Japan roaming prepaid and postpaid plans, check pay-per-use rates, and learn how to activate roaming before your trip.
Staying connected in Japan with your SIMBA mobile plan is possible, but coverage, plan type, and roaming charges depend on your setup. SIMBA connects through local partners in Japan, and understanding how it works in advance can help you avoid unexpected costs abroad.
This guide covers everything you need to know about SIMBA Japan roaming, including supported plans, data limits, pay-per-use rates, and how to activate data roaming step by step.
We’ll also introduce Holafly’s eSIM for Japan: a flexible SIMBA alternative with unlimited data and no contract.
Avoid hidden data costs
Get the full price upfront with a Holafly eSIM for Japan. Enjoy unlimited data at no extra cost.
Does SIMBA roaming work in Japan?
Yes, SIMBA roaming works in Japan through partner networks like KDDI and Rakuten Mobile. You can access mobile internet in Japan with your SIMBA plan, as long as your device supports VoLTE and 4G, and roaming is enabled.
SIMBA Japan roaming plans and price
SIMBA Japan roaming is available on prepaid and postpaid plans, with fixed roaming data included depending on your plan.
Below, we break down all SIMBA roaming in Japan options, including prepaid and postpaid plans, plus pay-per-use charges.
SIMBA prepaid roaming for Japan
Japan falls under SIMBA’s Group A destinations, making it eligible for roaming under most SuperRoam prepaid plans.
Each plan offers a fixed amount of data for a set period, charged in Singapore dollars (SGD).
Here is a breakdown of SIMBA prepaid roaming for Japan:
| Plan | Data Roaming Allowance | Price (SGD) | Validity |
|---|---|---|---|
| SuperRoam 10 | 3GB | $10 | 30 days |
| SuperRoam 12 | 8GB | $12 | 30 days |
| SuperRoam 18 | 10GB | $18 | 30 days |
| SuperRoam 20 | 12GB | $20 | 30 days |
| SuperRoam 25 | 15GB | $25 | 30 days |
These plans are suitable for short to mid-term travel and automatically include data roaming access in Japan.
SIMBA postpaid roaming for Japan
SIMBA postpaid users can also access Japan roaming through SuperRoam add-ons, available in a range of data sizes and durations. These plans are billed in Singapore dollars (SGD) and are valid for 30 days unless otherwise stated:
| Plan | Roaming Data Allowance | Price (SGD) | Validity |
|---|---|---|---|
| SuperRoam 10 | 3GB | $10 | 30 days |
| SuperRoam 12 | 8GB | $12 | 30 days |
| SuperRoam 13 | 8GB | $39 | 90 days |
| SuperRoam 18 | 10GB | $18 | 30 days |
| SuperRoam 20 | 12GB | $20 | 30 days |
| SuperRoam 25 | 15GB | $25 | 30 days |
| Seniors Plan | 3GB | $5 (promo) | 30 days |
Note: For both prepaid and postpaid plans, roaming data is shared across all Group A destinations. If you’re visiting more than one country, calculate your estimated data usage in advance to avoid running out of quota early in your trip.
SIMBA Japan pay-per-use roaming charges
If you exceed your data quota while using SIMBA Japan roaming, your usage automatically shifts to pay-per-use charges. For Group A countries like Japan, data is billed at $4 per GB, charged in blocks of 10MB.
To avoid unexpected roaming charges, it’s best to activate a SuperRoam plan before your trip and monitor your data use regularly.
How to activate SIMBA roaming for Japan
To ensure you’re connected as soon as you land, it’s best to activate SIMBA roaming before departure. Here’s how:
- Log in to the SIMBA App or portal.
- Check your plan to confirm Japan is included under your roaming coverage.
- Go to Data Roaming Settings and toggle roaming ON.
- Restart your phone upon arrival in Japan to connect to the local network.
Tip: Before travelling to Japan, check your data balance and make sure your account has sufficient credit to support roaming usage.
Connect instantly in Japan with Holafly unlimited eSIM
While SIMBA offers roaming in Japan, it comes with limits, capped data, shared roaming pools across countries, and costly pay-per-use fees once your quota runs out.
If you’re looking for a simpler way to stay connected, Holafly’s Japan eSIM offers an easy, contract-free alternative.
You can choose from two flexible options:
- Daily eSIM plan: From SGD $8 per day, ideal for short trips or city breaks.
- Holafly Monthly eSIM Plans: From USD $49.90/month, designed for remote workers, digital nomads, or long-term travellers.
Both eSIM plans include:
- Unlimited data at 5G speeds
- Coverage across Japan and 170+ global destinations
- 24/7 multilingual customer support
- Hotspot sharing and tethering
- Instant activation via QR code with no SIM swap needed
Whether you’re visiting Tokyo for a few days or working remotely across Japan, Holafly eSIM is a more straightforward option.
Get connected quicker
Buy, set up, and activate a Holafly Japan eSIM in no more than a few of minutes.
Disclaimer: The data in this article is accurate as of October 29th, 2025, and is subject to change.
Plans that may interest you
Formerly a travel journalist turned marketing copywriter, I found my way back to the travel world with Holafly—my dream company that made remote work possible. My motto? “Dream big and make it happen.” I’m passionate about writing, exploring the world, and staying active through walking, running, swimming, and hiking. I also love learning, reflecting, and connecting with inspiring minds.
