Rakuten Mobile Overseas Roaming 2GB Free 2026 Complete Guide for Foreigners in Japan [2026 Guide]

Are you a foreign resident in Japan who travels back home or overseas occasionally? If so, you’ve probably wondered whether your Japanese SIM card will work abroad — and how much it’ll cost you.

Rakuten Mobile offers a surprisingly useful overseas roaming feature that many users overlook: 2GB of free data roaming per month, included at no extra charge with your standard plan. Combined with one of the most competitive monthly rates in Japan, this makes Rakuten Mobile a strong option for internationally mobile residents.

In this guide, we’ll walk you through everything you need to know about Rakuten Mobile’s overseas roaming in 2026 — how it works, what’s covered, what the limitations are, and how you can get started with a bonus of up to 14,000 Rakuten Points through an employee referral.

What Is Rakuten Mobile’s Overseas Roaming Feature?

Rakuten Mobile includes 2GB of international roaming data per month as a standard part of its unlimited plan (¥3,278/month including tax). There is no separate roaming plan to sign up for, and no extra fee to activate it — it simply works when you travel abroad.

This is genuinely unusual in the Japanese mobile market. Most other carriers either charge a daily roaming fee or require you to purchase a separate international data add-on.

How the 2GB Roaming Works

Included automatically: No need to enable a special option. Your Rakuten Mobile SIM will automatically connect to local partner networks when you arrive in a supported country.
2GB per month: This is the data cap for roaming. Once you use 2GB, your data speed is reduced (throttled), but you are not charged extra.
Resets monthly: The 2GB allowance resets at the start of each calendar month, just like your domestic data.
Calls and SMS abroad: Voice calls and SMS while roaming are charged separately at standard international rates. The roaming benefit specifically covers data.

Supported Countries and Regions

As of 2026, Rakuten Mobile supports overseas roaming in over 70 countries and regions, including popular destinations such as:

United States
South Korea
Taiwan
Thailand
France, Germany, UK (and most of Europe)
Australia
China (limited availability)
Philippines, Vietnam, Indonesia
Brazil, Canada, and more

Before your trip, it’s always a good idea to check the official Rakuten Mobile website to confirm your specific destination is covered, as the list is updated periodically.

Why This Matters for Foreign Residents in Japan

If you’re a foreign national living in Japan, you likely travel home at least once a year — whether it’s for holidays, family visits, or work. Having a SIM that gives you basic data connectivity abroad without any additional fees is genuinely convenient.

Here are a few real-world scenarios where the 2GB roaming benefit helps:

Navigating at the airport or train station in your home country upon arrival
Sending messages via LINE or WhatsApp without needing to buy a local SIM immediately
Quick email or work check-ins during short business trips
Using Google Maps or translation apps in countries where you don’t speak the local language

For short trips of a few days, 2GB is often enough to cover basic needs. For longer stays, you might want to supplement with a local SIM or eSIM — but having the Rakuten roaming as a backup is always reassuring.

Understanding the Limitations

The 2GB roaming benefit is excellent for what it is, but it’s worth being realistic about what it covers and what it doesn’t.

Speed After 2GB

Once you exceed 2GB of roaming data in a given month, your connection speed will be throttled to approximately 128 kbps. This is slow — usable for basic messaging but not for streaming video or loading image-heavy pages.

If you need more data while abroad, you can purchase additional roaming data through the Rakuten Mobile app, though this comes at an extra cost.

Roaming Is Data Only (for Free)

The free 2GB covers data only. If you make voice calls or send SMS messages while roaming, those are billed separately at Rakuten Mobile’s standard international rates. Using VoIP apps like LINE, WhatsApp, or Zoom over the data connection is a popular workaround for many users.

Domestic Plan Still Applies

Your domestic unlimited data usage (within Japan) is completely separate from the roaming 2GB. The two don’t interfere with each other.

Rakuten Mobile’s Monthly Plan in 2026

Before diving into how to sign up, let’s recap the core plan details:

Feature	Details
Monthly fee	¥3,278 (tax included)
Domestic data	Unlimited
Domestic calls	Unlimited free via Rakuten Link app
Overseas roaming data	2GB/month included
Contract term	None (no cancellation fee)

At ¥3,278 per month with no contract lock-in, Rakuten Mobile remains one of the most cost-effective unlimited plans available in Japan. The fact that overseas roaming is bundled in at no extra charge adds meaningful value for anyone who travels.

For a deeper look at Rakuten Mobile’s free calling system within Japan, check out this useful breakdown: Rakuten Mobile Free Call System Complete Guide for Foreigners in Japan [2026 Guide].

If you’ve decided that Rakuten Mobile is right for you, there’s a smart way to sign up that gives you significantly more Rakuten Points than the standard campaign.

Standard Campaign vs. Employee Referral

Signup Method	MNP (Number Transfer)	New Number
Standard campaign	13,000 points	Varies
Employee referral	14,000 points	11,000 points

By signing up through an employee referral link, you receive:

14,000 Rakuten Points if you transfer your existing number (MNP) from another carrier
11,000 Rakuten Points if you sign up with a new phone number

The employee referral gives you 1,000 extra points on top of the standard MNP campaign — a small but worthwhile bonus just for using the right link.

When Are the Points Paid Out?

Points are not paid all at once. They are distributed in 3 installments, starting approximately 4 months after the month in which you first log in using the referral.

For example:

If you sign up and log in during June 2026, your first installment arrives around October 2026
The remaining installments follow in subsequent months

This installment structure is standard for Rakuten Mobile campaigns. The points are issued as Rakuten Points, which can be used across the broad Rakuten ecosystem — including Rakuten Ichiba, Rakuten Pay, and many partner stores.

Maximum Lines Per Person

You can apply the referral benefit to a maximum of 5 lines per person. If you’re looking to add lines for family members or a second device, they can also benefit from the referral campaign as long as the total doesn’t exceed 5 lines.

For more details on how the referral campaign works in full, including tips specific to foreigners in Japan: Rakuten Mobile Employee Referral Complete Guide for Foreigners in Japan [2026 Guide].

Things to Check Before Switching

If you’re currently on another carrier and thinking about switching to Rakuten Mobile, here are a few things worth considering:

Network Coverage

Rakuten Mobile has significantly expanded its own network infrastructure since launch, but there are still some rural areas where it relies on partner roaming (previously au’s network). If you live in a major city like Tokyo, Osaka, or Nagoya, coverage is generally excellent. If you live in a rural area, it’s worth checking the Rakuten Mobile coverage map before committing.

Compatible Devices

Most modern smartphones support Rakuten Mobile’s network bands, but it’s worth confirming your device is compatible, especially if you’re using a phone purchased outside Japan. Rakuten Mobile’s website has a device compatibility checker.

Previous Carrier Considerations

If you’re switching from a specific carrier, the experience may vary. Some users who switched from AU have noted certain differences in coverage and service — for a balanced perspective on that transition, this article covers it in detail: Rakuten Mobile AU to Rakuten Mobile Demerit Complete Guide for Foreigners in Japan [2026 Guide].

Practical Tips for Using Overseas Roaming

Once you’re on Rakuten Mobile, here’s how to make the most of your 2GB roaming allowance:

Enable roaming before you leave Japan: Check your phone’s settings and ensure data roaming is turned on. Some phones have this disabled by default.
Monitor your usage: Use the Rakuten Mobile app to track how much roaming data you’ve used. It updates in near real-time.
Use Wi-Fi whenever possible: Hotels, cafes, and airports often offer free Wi-Fi. Connect when available to preserve your 2GB for when you really need it.
Switch to low-data modes on apps: Streaming music or video can burn through data quickly. Switch apps like Spotify or YouTube to offline or lower-quality modes when roaming.
Use LINE or WhatsApp for calls: Rather than making traditional international calls (which cost extra), use VoIP apps over your roaming data connection.

Summary: Is Rakuten Mobile’s Roaming Worth It for Foreigners?

For foreign residents in Japan who travel occasionally, Rakuten Mobile’s 2GB roaming benefit is a genuine perk — especially because it costs nothing extra. Combined with an unlimited domestic plan at ¥3,278/month and no contract commitment, it’s one of the more foreigner-friendly options in Japan’s mobile market.

The free calling via the Rakuten Link app, the straightforward no-contract structure, and the 2GB roaming all add up to a package that suits the lifestyle of many internationally mobile residents in Japan.

If you’re ready to make the switch — or sign up for the first time — using an employee referral link is simply the best way to do it. You’ll receive 14,000 Rakuten Points for MNP or 11,000 points for a new signup, which is more than the standard campaign offers.

You can use the following referral link to sign up:

👉 Sign up for Rakuten Mobile via Employee Referral

Take a moment to confirm your current number transfer (MNP) details if applicable, have your Japanese residence card (在留カード) ready for identification, and you should be able to complete the application online in about 15–20 minutes.

Whether you’re primarily drawn by the overseas roaming, the unlimited data, or simply the competitive price, Rakuten Mobile is worth a serious look in 2026.