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公開2024.09.12更新2024.09.12

What are the 6 ways to use a Japanese smartphone/cell phone overseas?

Is it true that I will be charged a lot if I use my cell phone while traveling abroad? If you are having trouble connecting to the Internet when you arrive overseas, here are six ways to use your smartphone overseas and how to choose the best one for you. If you want to use your smartphone when traveling abroad, we recommend eSIM, which allows you to apply for secure communication locally and use it immediately.

Table of Contents

If you want to use your smartphone when traveling abroad, eSIM is recommended!

If you want to use your smartphone comfortably when traveling abroad, we recommend eSIM. eSIM is a digital SIM that does not require a physical SIM card, but is built directly into the device, making it easy to process and available in many countries, ensuring hassle-free communication while traveling abroad.

Why can't I use my phone abroad?

Functions that cannot be used overseas and the reasons why

The reason why you cannot use your smartphone abroad is mainly due to differences in communication networks and service plans that do not support international roaming. Devices may not support local communication standards, or carriers' services may have restrictions on use outside the country.

Can I use international data roaming if I am in an area covered by international data roaming?

International data roaming allows you to use your phone if you are in an area that is covered by the service. However, this service usually comes with a hefty fee, so it is important to check the details of your plan before using it.

Can international data roaming be expensive?

International data roaming can result in very expensive bills. As an example, source (1) reported a case where a small amount of data usage resulted in a bill of several hundred dollars. To avoid this, it is worth considering eSIM or other alternatives.

Source 1) If I make a phone call while traveling abroad, how will I and the other party be charged? (SoftBank Support)

Reference URL: https://www.softbank.jp/support/faq/view/11399

6 Ways to Use Your Phone Abroad

Below is a table summarizing the main methods of using a smartphone overseas and the advantages and disadvantages of each.

eSIM

eSIM is a method that does not require a physical SIM card, but uses a digital SIM built into the device.

Advantages of using an eSIM

Easy to purchase and switch plans online

Flexibility to use multiple plans on one device

Quickly secure communication while abroad

Disadvantages of using an eSIM

Supported devices and plans are still limited

Setup may require some initial learning

Settings and considerations when using an eSIM

Check for compatible devices

Follow the instructions from the provider to set up the eSIM

Check the rate plan before use

Who should use an eSIM?

Travelers visiting many countries in a short period of time

People who want to use multiple numbers and plans on one device

SIM Card

A SIM card is a physical chip that is inserted into a device.

Advantages of using a SIM card

Widely supported devices and plans

Familiar format provides peace of mind

Disadvantages of using a SIM card

Possibility of high fees for plan changes and international roaming

Risk of loss or damage

Settings and precautions when using a SIM card

Make sure your device is compatible with the local carrier's communication standards

When purchasing a SIM card locally, choose a store you can trust

Check plan details and prices in advance

Who is recommended to use a SIM card

People who stay in the same country for a long period of time

People who want to use a specific plan or carrier

Free Wi-Fi

Free Wi-Fi is a free Wi-Fi service provided in public places and facilities.

Advantages of Using Free Wi-Fi

Free of charge

Simple and easy to set up

Disadvantages of Using Free Wi-Fi

There is a security risk

Connection can be unstable and slow

Settings and precautions when using free Wi-Fi

Use security software to minimize risks

Be especially careful when entering personal information

Research available Wi-Fi spots in advance

Who should use free Wi-Fi?

People who only need to use the Internet for short periods of time

People who limit their use to light use, such as checking email or browsing maps

Rental Wi-Fi

Rental Wi-Fi is a method of renting and using portable Wi-Fi devices abroad.

Advantages of Using Rental Wi-Fi

Provides stable transmission speeds

Can connect multiple devices at the same time

Disadvantages of using rental Wi-Fi

Need to carry it with you

Battery life is limited

Usage fees can be expensive

Settings and Precautions for Using Rental Wi-Fi

Check usage fees and data limits

Check the battery life and charging method

Check the rental period and return procedures

Who is recommended to use rental Wi-Fi?

People who want to use multiple devices at the same time

People who want to ensure stable communication

About Overseas Roaming

Overseas roaming refers to using the telecommunication service of a carrier contracted in your home country overseas. Using this feature, you can make calls and use data communications using your home country's phone number while abroad.

Advantages of using overseas roaming

You can use the number of your home country as it is.

You can continue to use your home country's phone number overseas, so there is no need to notify your contact information to change.

Reliable means of communication in case of emergency

You can immediately contact your family, friends, and business associates in case of an emergency overseas.

Disadvantages of using overseas roaming

May incur high charges

You may be subject to expensive roaming charges based on data usage and talk time.

Service may not be available in some areas

Service may not be available outside of the service area.

Settings and Precautions when Using Overseas Roaming

Before leaving for overseas, contact your carrier to make sure roaming service is activated.

Consider signing up for a package plan or limiting data usage to reduce data roaming charges.

People for whom overseas roaming is recommended

Persons staying abroad for a short period of time

Business people who need to make emergency calls

Contract with a local carrier

Another option is to sign a contract directly with a local carrier. This is suitable for longer stays or when a more economical means of communication is required.

Advantages of contracting with a local carrier

Reduced costs

For longer stays, local plans are often more economical.

Full access to local services

You can take advantage of the local carrier's services and promotions.

Disadvantages of contracting with a local carrier

Need to get a new number

When you sign a contract with a local carrier, you will get a new phone number and will need to inform them of any changes in your contact information.

Contract process can be complicated

Language barriers and contract terms and conditions must be understood.

Setup and considerations when signing a contract with a local carrier

Research local carrier options in advance to compare reputations and plans.

Be prepared to provide the necessary documents, ID, and proof of residency for the contract.

Who is recommended to sign a contract with a local carrier

People who plan to stay abroad for an extended period of time

People who want to secure local communication at a low cost.

Conclusion

For a short stay as an individual, eSIM is recommended because it is easy, inexpensive, safe, and has fast communication speeds.

If this is your first time using an eSIM overseas, I recommend "trifa"!

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