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公開2024.12.22更新2024.12.22

How to use an au smartphone overseas and points to note

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For those who wish to use an au smartphone when traveling overseas, this section explains how to use an au cell phone overseas, including what to prepare in advance in Japan and what to set up locally.

Table of Contents

Can I use my au smartphone overseas without modification?

Need to change the contracted plan

When using an au smartphone overseas, you may need to change to a plan suitable for overseas use depending on your contracted plan. This is in order to use services that support data communication and calls overseas.

Why do I have to pay a high bill?

If you use your phone as-is overseas, you may incur data roaming charges, which can lead to unexpectedly high bills. This is due to additional charges for using foreign networks.

Precautions to avoid incurring high charges

Limitations on data communication

It is recommended that data communication abroad be kept to the minimum necessary and that Wi-Fi be utilized.

Calling Charges

Calls abroad are charged separately and can be very expensive, so it is advisable to refrain from using them unless necessary or to use a calling app.

Global Flat-rate Data Plan

Basic Information

The "World Data Flat-rate" plan is a service provided by au that allows you to use data communications overseas at a fixed rate.

(World Data Flat-rate | au)

Normal rates and countries covered

This plan has rates based on daily data usage, and the countries and regions covered are limited.

Advantages

Predictability of rates

Because rates are known in advance, it is easy to manage budgets.

Wide range of countries covered

Available in many countries and regions, convenient for overseas travel and business trips.

Cautions

Data usage limits

Speed limits may apply if a certain amount of data is exceeded.

Ineligible Services

Not available in some countries and regions, or additional charges may apply.

Overseas Double-Teigaku Plan

Basic Information

The "Overseas Double-Teigaku" plan is a plan for overseas use that combines data communication and calling.

(Overseas Double-Teigaku | au)

Normal rates and countries covered

This plan is also available in certain countries and regions, and rates vary depending on the plan.

Advantages

Calling and data set

For those who are concerned about calling charges, this plan offers peace of mind.

Clarity of rates

Since data and calls are combined, rates are clear.

Points to note

There are restrictions on calling time and conditions based on data usage.

Selecting a plan

You need to choose a plan that fits your usage.

Is there a way to avoid using an AU plan? How to use your smartphone when traveling overseas

In addition to au plans, there are multiple ways to use your smartphone overseas.

For personal use, an eSIM/SIM card is recommended!

An eSIM service that can be used instantly is "trifa", which is an easy and safe procedure.

Rental Wi-Fi is also an option if you want to use it with a companion.

If you are traveling in a group or have a large amount of data to use, renting Wi-Fi is convenient.

For your first overseas eSIM, we recommend "trifa!

Trifa is an eSIM application from Japan, and is the No. 1 app downloaded in Japan.

Its No. 1 attraction is the "ease of use" and "sense of security" of the app. After installing the app on your phone, all you have to do is follow the Japanese-language instructions. You can easily complete the overseas internet communication settings in as little as 3 minutes.

If you have any questions, Japanese chat support is available 24 hours a day, 7 days a week, so even those who are new to eSIM or unfamiliar with smartphone operation can use the service with peace of mind.

Furthermore, since the fees are "completely prepaid," you will never be charged more than you have paid before using the service. So, you don't have to worry about "I used too much overseas data, will I get a high bill later? You can enjoy your overseas trip comfortably and happily without such worries as "I might use too much data overseas and get a high bill later..."!

Thank you for reading this article to the end. We hope this article has answered some of your questions about eSIM.