Airalo Japan Review: Is Moshi Moshi Really the Best Choice for Your Trip?

What is Airalo? Basic Info on eSIMs for Japan

Airalo Service Overview

Founded in 2019, Airalo is the world’s first eSIM store. Supporting over 200 countries and regions, it is highly regarded by global travelers. Its biggest feature is that it eliminates the need for a physical SIM card by allowing you to install a digital one directly onto your smartphone. It is praised for its convenience, allowing users to easily purchase and set up the service via an app and connect to the internet immediately upon arrival.

Source: Airalo

Features of Airalo’s eSIM for Japan

Airalo’s Japan-specific eSIM is provided under the name "Moshi Moshi." The term "Moshi Moshi" is what Japanese people say when answering the phone. Like almost all travel eSIMs, Airalo’s service is data-only, meaning it does not support voice calls. Despite the name "Moshi Moshi" sounding like it’s for talking, please note that Airalo's eSIM does not include a voice call feature.

• Network Provider: Uses SoftBank or KDDI (au) networks
• Connection Method: Home-Routed Roaming
• Network Standards: 4G LTE / 5G (varies by area)
• Data Only: Does not support voice calls or SMS (VoIP apps like WhatsApp are usable)

What is the Home-Routed Roaming Method?

Many global eSIMs, including Airalo, utilize a connection method called "Home-Routed Roaming." This means that even though you are using SoftBank or KDDI signals within Japan, your data actually travels through an overseas server (such as Singapore or the U.S.) before connecting to the internet.

Specifically:

1. Your Smartphone → Japanese Carrier Base Station (SoftBank/KDDI)
2. Base Station → Overseas Home Network (e.g., Singapore)
3. Overseas Server → The Internet

Disadvantages of this method:
✗ Latency issues
Because the data is routed overseas, an additional delay of about 40–100ms occurs. While this isn't a problem for web browsing or social media, you may experience lag during online gaming or video conferences.
✗ Potential issues with Japan-only services
Since your IP address is recognized as being overseas (Singapore, U.S., etc.), the following services may be unavailable or restricted:

• Japanese streaming services (Netflix Japan, TVer, ABEMA, etc.)
• Digital payment services limited to Japan
• Some banking or credit card authentication systems
• Location-based services (some coupon apps, etc.)

Some users have reported their location being detected as Singapore or receiving alerts regarding access from abroad on certain services.

Sources: esimdb.com "Airalo Travel eSIM for Japan", Nomad "Why Do You Need to Turn on Data Roaming for Travel eSIMs?"

According to several real-world reviews, average download speeds in urban areas have reached over 300 Mbps, indicating excellent speed. However, it is important to understand the limitations specific to home-routed roaming mentioned above.

Sources: Tokyo Cheapo "The Best eSIMs for Visiting Japan", Where and Wander "Airalo Vs Ubigi In Japan"

Does Airalo Really Work in Japan? The Reality of Connection Quality

Coverage Area in Japan

Since Airalo uses the SoftBank or KDDI networks, it offers extensive coverage across Japan. Stable connections are available in major cities like Tokyo, Osaka, and Kyoto, as well as most parts of mainland Japan. However, the signal may weaken in mountainous areas or on remote islands. Actual user reviews frequently report successful use across a wide range of locations, from Hokkaido to Tokyo, Kyoto, and Osaka.

Source: A Nomad's Passport "Using the Airalo eSim in Japan"

Connection Speed and Stability

• Average Download Speed: 308 Mbps (According to Tokyo Cheapo)
• 5G Connection: Stable 5G access is available in urban areas
• Latency: 40ms and up (with additional delay due to overseas routing)
• IP Address: Displays overseas locations like Singapore or the U.S.

The speed is more than sufficient for general internet use, such as YouTube streaming, video calls, and social media. However, some users have reported unstable connections or slow speeds. This is often due to device compatibility, setup errors, or local signal conditions—issues common to all eSIMs rather than being unique to Airalo.

Additionally, because of the home-routing method, there are reports of being unable to access certain Japanese services or receiving security alerts from Microsoft because the IP address shows up as Singapore. These are unavoidable side effects of using a home-routed eSIM.

Sources: Tokyo Cheapo, esimdb.com "Airalo Travel eSIM for Japan"

User Experience in Crowded Areas and Tourist Spots

There are many reports of successful connections at major tourist destinations such as Asakusa, Kiyomizu-dera in Kyoto, and Namba in Osaka. However, during extremely busy periods or locations—such as New Year’s or cherry blossom season—the carrier networks themselves may become congested, leading to slower speeds. This is a challenge common to all mobile communications in Japan, not just eSIMs.

Airalo Japan eSIM Rates and Data Plans

As of January 2026, the main plans for the Airalo Japan eSIM are as follows.
*Prices are based on USD ($4.50–$26) converted at an estimated rate of 1 USD = 155 JPY. Rates vary depending on the exchange rate. Promotional discounts may also be available periodically.

Please note that while Airalo offers "Unlimited" plans, they actually have a limit of 3GB per day, after which speeds are restricted. It is important to know that these are not truly "unlimited" plans.

Will I Have Enough Data for My Trip?

Average usage estimates for travelers:

• Short stay (3–5 days): Approx. 3–5GB
• 1-week stay: Approx. 5–10GB
• Stays of 2 weeks or more: 10–20GB+

For general use like Google Maps, searching for restaurants, and posting photos to social media, about 1GB per day is usually sufficient. However, if you frequently stream videos or make video calls, you will need more data. If you run out, you can easily top up through the app.

Pros and Cons Based on Actual Reviews

Sources: Trustpilot, Apple App Store, esimdb.com, eSIM Portal "Is Airalo's Reputation Bad?"

Difference from Holafly eSIM Japan

Fundamental Differences Between Airalo and Holafly

Airalo: Fixed Data Model

Holafly: High Capacity

*Holafly prices calculated at 1 USD = 155 JPY. Sources: Airalo Official Website, Holafly Official Website

Which One is Right for You?

Airalo is for you if:

• You can predict your data usage
• You want to keep costs to a minimum
• You plan on using Wi-Fi alongside the eSIM
• You are staying for a short period (3–7 days)
• Your usage is mainly email, maps, and social media

Holafly is for you if:

• You want to use data without worrying about limits
• You frequently watch videos or make video calls
• You are staying for a long period (2 weeks or more)
• You plan to visit places with limited Wi-Fi
• You don't use the personal hotspot feature much

Is a Japan-Specific eSIM a Good Choice?

Global eSIM vs. Japan-Specific eSIM

Airalo and Holafly are considered "Global eSIMs," designed to work in countries all over the world. In contrast, Japan-specific eSIMs are services specialized for the Japanese market.

Features of Global eSIMs:

• Multi-country support; works anywhere in the world
• Can be purchased through the same app for various countries
• Pricing is based on international market rates
• Home-Routed Roaming: Data travels through overseas servers
• Overseas IP: Potential restrictions on Japanese services

Features of Japan-Specific eSIMs:

• Specifically designed for travelers in Japan
• Direct contracts with Japanese telecommunications providers
• Pricing is optimized for the Japanese market
• Local Breakout Method: Direct connection to Japanese carriers
• Japan IP Address: All Japanese services work without issue

Why Japan-Specific eSIMs are Advantageous for Travel in Japan

Japan-specific eSIMs offer the following benefits that global eSIMs do not:

1. Full Access to Domestic Japanese Services
Services like Netflix Japan, TVer, ABEMA, Japanese banking apps, and digital payment services can be used without restrictions. Since your IP address is recognized as being within Japan, location-based services function correctly.

2. Lower Latency
Because data does not pass through overseas servers, you avoid the 40–100ms delay typical of home-routed roaming. This ensures a comfortable experience for online meetings and gaming.

3. Better Cost Performance
By specializing in the Japanese market, these providers reduce middleman margins, offering more competitive prices.

4. Connection Quality
They partner directly with major Japanese carriers (especially Docomo) to provide the most reliable network possible.

5. Flexible Data Capacities
Plans are designed based on the actual needs of travelers in Japan.

6. Optimized Duration
Plans are tailored to typical stay durations in Japan (1–2 weeks).

For these reasons, a Japan-specific eSIM is the ideal choice for travelers visiting "only Japan" who want to use Japanese services without limits and minimize latency.

A Representative Example: What is Travel Mobile?

Features of Travel Mobile eSIM

A leading example of a Japan-specific eSIM is Travel Mobile (https://travelmobile.work/).

Basic Information:

• Network Provider: NTT Docomo (Japan’s largest carrier)
• Connection Method: Local Breakout (Direct connection to Japanese carrier)
• Network Standards: 4G LTE
• Data Only: No voice calls or SMS support
• Tethering: Available (APN settings may be required)
• IP Address: Domestic Japanese IP address

Primary Plans:

The Superiority of the Docomo Network:
Docomo has the widest coverage across Japan, ensuring stable connections even in mountainous areas and remote islands. Furthermore, the local breakout method provides a Japanese IP address, allowing unrestricted access to all Japanese online services.

Travel Mobile

Quick Comparison with Airalo and Holafly

Assuming a 10-day trip:

Assuming a 2-week trip:

In terms of cost per gigabyte, Travel Mobile is extremely competitive.

• You want to use Japanese services without limits (Netflix Japan, banking, payments, etc.)
• You want to minimize latency (video conferences, gaming)
• You want large amounts of data at a low price in environments with little Wi-Fi

If the above points are important to you, Travel Mobile is a very strong option.

Who is Travel Mobile Best For?

Travel Mobile is particularly recommended for travelers who:

• Are visiting only Japan
• Are staying for 1 to 2 weeks
• Want to use Japanese streaming services or banking apps
• Want large amounts of data at a low cost
• Require the wide coverage provided by Docomo
• Plan to visit rural or mountainous areas
• Use tethering/hotspots frequently
• Want to minimize latency for things like online meetings or games

Who it might NOT be for:

• Travelers visiting multiple countries including Japan
• Those staying for a very short period (less than 3 days)
• Those with very low data usage (under 5GB)
• Those already comfortable with apps like Airalo
• Those who prioritize the flexibility of a multi-country service

3-Way Comparison Summary (Airalo / Holafly / Japan-Specific eSIM)

Here is a summary table of each service's features:

Price Comparison

Data Specifications

*Holafly has a Fair Usage Policy (FUP) regarding daily data communication capacity.

Service Compatibility Comparison

Stability

Best Travel Style for Each

Airalo:

• Cost-conscious
• Short stays (3–7 days)
• Predictable data usage
• Possible multi-country travel
• Doesn't need Japan-only services

Holafly:

• Doesn't want to worry about data limits
• Frequent video streaming or calling
• Long stays (2 weeks+)
• Visiting areas with little Wi-Fi
• Doesn't use personal hotspots much

Travel Mobile (Japan-Specific eSIM):

• Staying only in Japan
• Wants high data capacity at a low price
• Visiting rural or mountainous areas
• Prioritizes cost-performance
• Wants unrestricted access to Japanese services
• Wants to minimize latency

Important Notes for eSIM Purchase and Setup (General)

Pre-Purchase Checklist

Before purchasing an eSIM, please ensure the following:

• ✓ Check if your device is eSIM compatible
  • iPhone XS or later, Google Pixel 3 or later, etc.
  • Check if an "EID" is visible in your device settings.
  • Enter "*#06#" on your keypad to verify.
• ✓ Check if your SIM is unlocked
  • If you bought your device from a carrier, it may need to be unlocked.
  • You can check and unlock it via your carrier's website.
• ✓ Secure an internet connection
  • An internet connection is required to download and install the eSIM.
  • We recommend setting it up in a Wi-Fi environment before departing for Japan.

Setup Timing: Before and After Arrival in Japan

Recommended setup procedure:

1. Before Departure (24–48 hours before arrival in Japan)
   • Purchase the eSIM
   • Scan the QR code to install
   • Do not activate it yet
2. In-flight or Immediately Upon Arrival
   • Select the eSIM as your primary line
   • The device will automatically connect to the network

Troubleshooting:
If it won't connect: Toggle Airplane Mode ON/OFF
If APN settings are required: Follow the provided manual
If it still doesn't work: Contact customer support

Important Note:

• Once deleted, an eSIM usually cannot be reinstalled.

FAQ

Which eSIM Should You Choose for Your Trip to Japan?

The best eSIM choice for your trip to Japan depends on your travel style and what you prioritize.

Recommendations by Pattern

• For cost-conscious travelers or short stays (3–7 days) → Airalo
  Reason: Flexible data options, affordable pricing, and multi-country support. Note: Restrictions may apply to Japan-only services.
• For those who don't want to worry about data usage → Holafly
  Reason: Peace of mind with unlimited plans for video and streaming. Note: Higher price point and restrictions on Japan-only services.
• For Japan-specific needs and low-cost high capacity → Travel Mobile (Japan-Specific eSIM)
  Reason: Wide Docomo coverage, excellent value, reliable in rural areas, and full access to all Japanese services. Best for those using Netflix Japan, TVer, or banking apps, and those concerned about latency.
• For those traveling to multiple countries → Airalo or Holafly
  Reason: Use the same eSIM across multiple countries outside of Japan.

Crucial Selection Criteria: Understanding the "Connection Method"

Often overlooked, the "Connection Method" is actually the most important factor in choosing an eSIM:

Home-Routed Roaming (Airalo / Holafly):

• ✓ Flexible use worldwide
• ✓ Convenient for multi-country trips
• ✗ Restrictions on Japanese services (Netflix Japan, banking apps, etc.)
• ✗ 40–100ms additional latency
• ✗ IP address treated as being abroad

Local Breakout Method (Travel Mobile):

• ✓ Full access to all Japanese services
• ✓ Minimal latency
• ✓ Domestic Japanese IP address
• ✓ Great cost-performance
• ✗ Only usable within Japan

Final Tips for Choosing

• Check the services you want to use: If you plan on using Netflix Japan, banking apps, or payment services → Choose a Japan-specific eSIM.
• Check the duration of your stay: Airalo for short stays; Holafly or Travel Mobile for longer ones.
• Predict your data usage: Airalo for light users; Holafly or Travel Mobile for heavy users.
• Check your destination: If you are visiting many rural areas, Travel Mobile (Docomo) is best.
• Set your budget: Travel Mobile offers the best value, followed by Airalo.
• Multi-country plans: If you have them, choose global eSIMs like Airalo or Holafly.
• Concerned about lag? If you have online meetings or games → Choose a Japan-specific eSIM.

Practical Examples

• Case 1: 1-week sightseeing in Tokyo and Osaka with lots of video streaming → Travel Mobile 30GB/8 days (3,200 JPY) is the best. You can watch Netflix Japan and get the best value.
• Case 2: 2-week trip across Japan and Korea → Airalo’s multi-country plan is convenient as you can use the same eSIM in both countries.
• Case 3: 3-week stay with many video conferences → Travel Mobile 50GB/31 days (4,900 JPY). Low latency makes video calls smooth.
• Case 4: Budget is no issue and you want unlimited data → Holafly Unlimited Plan. Note that Japanese services may have limitations.

Final Thoughts

Airalo, Holafly, and Japan-specific eSIMs like Travel Mobile each have their own pros and cons. The important thing isn't which one is objectively "better," but which one fits your travel style and priorities.
In particular, whether you need unrestricted access to Japanese services and whether you are visiting multiple countries are key deciding factors.
Use the information in this article to find the perfect eSIM for you and enjoy a seamless trip to Japan!

References and Sources:

• Airalo Official Site
• Holafly Official Site
• Travel Mobile Official Site
• Tokyo Cheapo "The Best eSIMs for Visiting Japan"
• esimdb.com "Airalo Travel eSIM for Japan"
• Where and Wander "Airalo Vs Ubigi In Japan"
• esim.love "Trying out Airalo eSIM in Japan"
• A Nomad's Passport "Using the Airalo eSim in Japan"

*Price information is current as of January 2026.