1. Basic information you need to know when using your smartphone while traveling abroad

1.1 Choices for how to use smartphones

There are several options when using your smartphone while traveling abroad. Each method has its advantages and disadvantages, so choose the method that best suits your travel destination and budget.

1. Mobile phone company international roaming services
   Overseas roaming is the easiest way to use your current mobile phone company's services. There's no need to change or set up a SIM card, so you can use your smartphone as soon as you arrive at your destination. Many mobile carriers offer flat-rate packet services, which has the advantage of keeping data costs down while traveling. However, some plans can be expensive, so it's important to check the details in advance.
2. Use a local SIM card or eSIM
   By purchasing a local SIM card or eSIM, you can use your smartphone at a low cost using the local communication network. Since you will need a SIM-free smartphone, you will need to unlock the SIM beforehand. Also, eSIMs are convenient because they do not require physical replacement of SIM cards, and you can sign up online and start using them immediately. However, SIM cards and eSIMs must be purchased at the local airport or city, which can cause language barriers and hassle in setting them up.
3. Use of rental Wi-Fi routers
   Renting a Wi-Fi router is a good option, especially if you plan to use data communications frequently. By simply carrying a Wi-Fi router with you, you can connect multiple devices, such as smartphones and tablets, at the same time, and the communication speed is relatively stable. You can also reserve in advance and pick it up and return it at the airport, making it easy to prepare before traveling. However, you will need to carry the device with you, so you will need to be careful not to run out of battery.

By deciding in advance how you will use your smartphone, you can avoid communication problems while traveling.

1.2 Essential smartphone settings: Checkpoints before departure and after arrival

To use your smartphone safely and efficiently while traveling abroad, it is extremely important to configure it properly before you leave and after you arrive at your destination. These settings are basic measures to avoid expensive communication charges and use your smartphone with peace of mind.

1. Turn off data roaming
   Many smartphones have a feature called "data roaming" that automatically connects to the local carrier's network. However, if you do not turn off this feature, you may incur high data communication charges without realizing it. Before traveling, turn off "data roaming" from your smartphone's settings screen. This will prevent data communication from being performed automatically when you arrive overseas.
2. Mobile data settings
   For added peace of mind, it is also effective to turn off "Mobile Data Communication" itself. If you are using a hotel or cafe with a good Wi-Fi environment, turning this setting off will prevent unexpected data communication. Also, when you use the communication at the local site, you can turn it on manually as needed to avoid unnecessary communication.
3. Wi-Fi settings and security measures
   Public Wi-Fi is free and convenient, but it can be a security risk. Turn off "auto-connect" in your device settings and only connect manually to trusted Wi-Fi networks. You can also make your connection more secure by using a VPN (Virtual Private Network).
4. Turn off automatic app updates
   Many smartphones have the automatic app update feature turned on by default, which can cause a large amount of data usage when traveling abroad. By turning off automatic app updates before traveling, you can prevent unintentional large amounts of data usage.

By making these basic settings, you can avoid unnecessary data usage and high charges while traveling abroad, and use your smartphone with peace of mind.

2. Recommended ways to use your smartphone when traveling abroad

2.1 Using a rental Wi-Fi router

Renting a Wi-Fi router is a convenient way to connect your smartphone or multiple devices to the Internet stably while traveling abroad. It is especially recommended when you have a large amount of data traffic or want to share the connection with multiple people. Here we will introduce the steps to use a rental Wi-Fi router and its benefits.

1. Advance reservation for smooth pick-up
   It is common to reserve a rental Wi-Fi router online before traveling and pick it up at the airport or at home. By applying in advance, you can use the internet as soon as you arrive, eliminating the need for local procedures. Many companies also offer the option to pick it up at the airport counter or have it delivered to your home, making it very convenient.
2. A wide range of devices can be connected
   The main appeal of rental Wi-Fi routers is that you can connect multiple devices at the same time, such as smartphones, tablets, and computers. When traveling with family or friends, you can reduce communication costs by sharing one router. In particular, if you choose a plan with a large data capacity, you can comfortably use it for data-intensive activities such as watching videos and using map apps.
3. Speed ​​and Stability
   Rental Wi-Fi routers use the local mobile communication network, so you can expect stable communication speeds. Many countries and regions support high-speed 4G and 5G lines, so you can surf the web, post on social media, and make video calls without any problems while sightseeing. However, communication may be unstable in some areas, such as mountainous regions and remote islands, so it is a good idea to check the coverage area in advance.
4. Pay attention to battery management
   Rental Wi-Fi routers run on batteries, so we recommend carrying a mobile battery if you plan to use them for long periods of time. In particular, if you plan to spend a long day sightseeing or traveling, if the battery runs out, communication will be cut off, so it is a good idea to prepare a spare power source in advance.

By using a rental Wi-Fi router, you can ensure a stable Internet connection even while traveling abroad, allowing you to comfortably use your smartphone and other devices.

2.2 Difference between eSIM and SIM card

When using a smartphone while traveling abroad, the convenience and cost will vary greatly depending on whether you choose an eSIM or a physical SIM card. Understand the features of each and choose the method that best suits your destination and usage situation.

1. Features of eSIM
   eSIM (embedded SIM) is a system that uses an electronic chip built into the smartphone itself, without the need to replace a physical SIM card. The biggest advantage is that you can easily purchase a communication plan via the Internet once you arrive at your destination and start using it immediately. In addition, if your smartphone supports eSIM, you can use a physical SIM card and an eSIM at the same time, so you can use separate phone numbers for work and personal use. This is also convenient if you visit multiple countries during your trip.
   However, not all smartphones support eSIM, so you need to check in advance whether your smartphone supports it.
2. Physical SIM card features
   A physical SIM card is a traditional method of using local communication networks by purchasing it locally and inserting it into your smartphone. It can be easily purchased at local airports or shops in the city, but it does require some effort as you need to replace and set up the SIM card. The advantage is that it is relatively inexpensive, making it easy to keep costs down if you are staying for a long time or using a lot of data. However, if you are worried about where to purchase it or the language barrier, you can also purchase it in Japan in advance.

eSIMs are highly convenient, while physical SIMs are cost-effective, so it is important to understand the features of each and choose accordingly.

2.3 How to purchase a SIM card

When using a smartphone while traveling abroad, purchasing a SIM card locally is one of the most common ways to keep costs down. Purchasing a SIM card is relatively easy, but knowing the procedure will help you start using your smartphone smoothly.

1. Buy a SIM card at the local airport
   In many countries, there are SIM card stores in the airport where you can purchase one immediately after arriving. This method is convenient for people who want to connect to the network immediately after arriving. Purchasing at the airport is easy, and the sales staff will often insert the card into your smartphone and assist you with the necessary settings. However, the prices at the airport may be higher than in the city.
2. Purchases at stores and convenience stores in the city
   You can easily purchase SIM cards at shopping malls and convenience stores in the city. Prices are often cheaper than at the airport, so if you want to keep costs down, we recommend purchasing in the city. However, you will need to insert and set up the SIM card yourself, so some knowledge is required. Also, if there is a language barrier, it is a good idea to prepare a translation app in advance.
3. Purchase in advance in Japan
   You can also purchase an overseas SIM card from an online shop (such as Amazon or Rakuten Ichiba) before you leave for Japan. This method is recommended for those who are unsure about purchasing and setting up a SIM card locally. SIM cards purchased in advance in Japan can be used immediately after arrival by simply replacing them, saving you the trouble of having to search for a SIM card at the airport or in the city. Be sure to check in advance which countries and communication plans are available.

If you know how to purchase a SIM card, you can start communicating smoothly once you arrive at your destination, making your trip more enjoyable.

3. How to use your carrier's overseas flat-rate data plan

3.1 What is international roaming service?

Overseas roaming service is a system that allows you to connect to overseas communication networks using the same lines of your domestic mobile phone company. This allows you to use your smartphone overseas just like you normally would, without having to change or set up a SIM card. If you sign up for a compatible plan with your current mobile phone company before you leave, you can use data communication and calls at a flat rate.

1. How roaming works
   With international roaming, domestic mobile carriers partner with local telecommunications companies, and smartphones automatically connect to the local network. For example, if a Japanese carrier partners with an American telecommunications company, when you arrive in the US, you will automatically connect to that company's network, and you will be able to use your smartphone just like you would in Japan.
2. merit
   The biggest advantage of international roaming services is their convenience. No special preparations are required before traveling, there is no need to replace your SIM card, and there is almost no need to change any settings, so you can use the internet and make phone calls immediately after arriving. In addition, you can use calls and SMS just as you normally would, and messaging apps such as LINE and email can be used without any problems, making it easy to respond to sudden contact.
3. Disadvantages
   On the other hand, roaming services can be expensive. Data communication charges are often particularly high, which can be costly for travelers who are staying for a long time or who use a lot of data. Some carriers offer flat-rate plans per day, so it is important to check the plan that best suits your destination and usage situation.

While using international roaming services makes it easy to use your smartphone, there are cost disadvantages, so it's important to choose a plan that suits your frequency and duration of use.

3.2 Points to note when using the service

There are a few important points to keep in mind when using international roaming services. By checking these in advance, you can avoid unexpected trouble and expensive charges and use your smartphone with peace of mind.

1. Check data roaming settings
   When you arrive abroad, your phone will automatically connect to the local network, so it's important to check your data roaming settings before you leave. If data roaming is not turned off, your phone may automatically connect to the local carrier and use data unexpectedly. Make sure your roaming settings are off, and turn it on manually if necessary.
2. Countries and areas covered by subscription plans
   International roaming services are not available in all countries and regions. It is important to check in advance which countries and areas are covered by your carrier's flat-rate plan. In particular, roaming may not be available in some areas of Africa and Central and South America. If you are outside the coverage area, you may incur high communication charges, so be sure to check the details before traveling.
3. Data communication limit
   Roaming services generally have limits on the amount of data that can be used per day or month. In particular, you should be careful with activities that consume a lot of data, such as streaming videos, using social media, and using map apps. If your data usage exceeds the plan limit, you may be charged extra or your communication speed may be restricted. It is also effective to be aware of the amount of data you use and make the most of your Wi-Fi environment.
4. Check if flat-rate packet plan is applicable
   Many carriers automatically apply flat-rate packet plans, but some plans require manual application. In particular, if you are using a plan for short-term travelers or a special data package, be sure to complete the application process in advance.

When using international roaming services, you need to be prepared and careful in advance. Make sure to check the range and settings of your flat-rate plan carefully to ensure a comfortable communication environment.

4. Smart ways to use free Wi-Fi when traveling abroad and things to be careful about

4.1 How to use free Wi-Fi in hotels and cafes

When traveling abroad, it is very convenient to use free Wi-Fi in public places such as hotels and cafes. However, when using free Wi-Fi, there are some basic points to keep in mind to ensure a smooth and safe internet connection.

1. How to connect to Wi-Fi
   Many hotels and cafes allow you to connect to the Internet for free by asking the front desk or staff for the Wi-Fi network name (SSID) and password. When connecting to the network, it is important to connect to the correct SSID provided. There are also fake Wi-Fi networks in public places, so be careful not to connect to the wrong network.
2. Pay attention to the terms of use
   Some public Wi-Fi requires you to agree to terms of use and policies before connecting. You may be asked to provide personal information, so enter only the minimum necessary information and be careful of suspicious content. Also, advertisements may be displayed automatically after connecting, but this is also a service provided as part of the terms of use.
3. Communications Security Measures
   Public Wi-Fi often has weak security and there is a risk of personal information and confidential data being stolen. Avoid using highly confidential operations such as banking apps and online shopping. If you want to use it safely, you can use a VPN (Virtual Private Network) to encrypt your data communication and prevent third parties from snooping.
4. Connection Stability and Range
   Wi-Fi in hotels and cafes can be unstable depending on the location. In particular, communication may be more likely to be interrupted in rooms or corners far from the Wi-Fi router. Therefore, if the connection is unstable, try using it in a location closer to the router. Also, the line may slow down during busy times, so it is also effective to use it at the right time.

When using public Wi-Fi, be sure to pay attention to security and connection stability and use the internet safely and in the right way.

4.2 Security Risks and the Importance of VPNs

When using free Wi-Fi while traveling abroad, it is very important to understand the security risks and take appropriate measures. Public Wi-Fi networks are particularly vulnerable to security risks, making them vulnerable to malicious third parties stealing personal information and accessing data. To minimize this risk, it is recommended to use a Virtual Private Network (VPN).

1. The risks of public Wi-Fi
   Public Wi-Fi often lacks encryption, making it easy for third parties to steal your data. For example, Wi-Fi networks in cafes, airports, and hotels do not encrypt communications, so other users on the same network can intercept your data. You should be especially careful when using websites that require you to enter a password, or that handle online banking or credit card information.
2. The role of VPNs
   A VPN (Virtual Private Network) is an effective way to encrypt your internet connection and prevent outsiders from snooping and stealing your data. When you use a VPN, your communications are encrypted and cannot be read by third parties. In addition, your IP address is routed through the VPN server, hiding your location and providing a more secure internet connection. This ensures your privacy and safety even when using public Wi-Fi.
3. How to Choose a Trustworthy VPN
   It is important to choose a reliable VPN service. Free VPN services exist, but they may have slow connection speeds or problems handling data. Therefore, it is recommended to choose a paid, reliable VPN provider. Major VPN providers offer strong encryption technology and access to servers around the world, ensuring stable communication.
4. Additional security measures
   In addition to using a VPN, it is also effective to install a firewall and antivirus software on your smartphone and computer. Also, when using public Wi-Fi, you can avoid connecting to dangerous networks by turning off the automatic connection setting and selecting only trusted networks.

A VPN is a vital tool for ensuring a safe internet connection, especially when using public Wi-Fi.

4.3 Things to avoid when using public Wi-Fi

Using public Wi-Fi while traveling abroad is very convenient, but it also poses increased security risks if you do not take appropriate measures. Below are some actions to avoid when using public Wi-Fi. Understanding and practicing these can help you use the Internet more safely.

1. Avoid entering sensitive personal information
   When using public Wi-Fi, try to avoid entering sensitive personal information, such as passwords or credit card details. If this information is transmitted over an insecure network, it is at higher risk of being intercepted or eavesdropped on by third parties. Avoid using important services, such as banking apps or shopping sites.
2. Do not connect to suspicious Wi-Fi networks
   Public Wi-Fi can contain fake Wi-Fi networks created by malicious third parties. Even if the network name (SSID) looks similar to an official one, it is important to check whether it is from a legitimate provider. Ask the provider (such as a cafe or hotel) directly to ensure you connect to the correct network.
3. Turn off the "Auto-connect" feature
   Smartphones and tablets have a function that automatically reconnects to Wi-Fi networks that you have previously connected to, but this function can increase security risks. In public places, we recommend turning off the "Auto-connect" function to prevent connecting to unexpected networks.
4. Avoid automatic software updates
   It is best to avoid updating apps or the operating system on your smartphone or computer while using public Wi-Fi. Not only will the update use up a lot of data, but if you lose connection during the update, your data may be corrupted. It is best to update software over the secure Wi-Fi network at home.

By understanding these risks and taking safe actions when using public Wi-Fi, you can use the internet safely.

5. Preparations for safe use of smartphones when traveling abroad

5.1 Smartphone security measures

In order to use your smartphone safely while traveling abroad, it is extremely important to take proper security measures in advance. In particular, since you will have more opportunities to use public Wi-Fi, it is necessary to further strengthen the security of your smartphone. Here we will introduce the main security measures you should take while traveling.

1. Setting the smartphone lock function
   Setting a lock function such as a passcode, fingerprint authentication, or face authentication on the lock screen of your smartphone is the most basic security measure. In the unlikely event that you lose your smartphone, be sure to enable the lock function to prevent unauthorized access by third parties. We also recommend that you choose a passcode that is difficult to guess and change it regularly.
2. Installing antivirus software
   Smartphones, like PCs, are at risk of being infected with viruses and malware. Especially when using public Wi-Fi or when you have the opportunity to access suspicious websites, installing antivirus software can reduce the risk of virus infection and unauthorized access. Choose a reliable antivirus software and scan it regularly to stay safe at all times.
3. Configuring the Remote Wipe Feature
   Even if your smartphone is lost or stolen, you can remotely delete the data on your smartphone by enabling the remote wipe function. By using features such as "Find My iPhone" on iPhone and "Find My Device" on Android, you can check the current location of your smartphone, lock it, and erase the data. Be sure to enable the remote wipe function to protect important personal information and confidential data.
4. Take regular backups
   It is important to regularly back up photos, data, contacts, etc. stored on your smartphone to avoid the risk of losing them or being damaged by a virus infection. By storing data on a cloud service or external storage, you can protect your important data even if your smartphone breaks down or is stolen.

By taking thorough security measures while traveling, you can use your smartphone with peace of mind and respond quickly if any problems arise.

5.2 Introduction of useful apps for overseas travel

To get the most out of your smartphone while traveling abroad, it is important to use a variety of convenient apps. This will make it easier to get around and gather information at your destination, allowing you to enjoy your trip comfortably. Here, we will summarize useful functions and how to use the apps, without naming specific ones.

1. Maps app
   Map apps make it easy to find local tourist attractions, restaurants, hotels, etc. Using the route guidance function makes it easier to travel on foot or by public transport, and especially if you download offline maps in advance, you can use them even without an internet connection.
2. Translation App
   Translation apps that overcome language barriers are especially useful when you are in a new country. In addition to text input and voice input, apps that use the camera to translate signs and menus in real time can help you understand local information instantly and communicate better.
3. Currency Converter App
   Currency conversion apps are extremely useful when shopping or eating out abroad. They allow you to easily convert currency using the latest exchange rates, and have the ability to use the latest rates offline, making them easy to use even in places with poor internet connection.
4. Travel schedule management app
   A travel app that can manage your travel plans and reservations in one place can help you organize your itinerary. It automatically consolidates flight and hotel reservations, making it easy to check your schedule while traveling. If it has an alert function, you will be notified immediately of flight delays or gate changes.
5. Wi-Fi hotspot search app
   Using an app to find free Wi-Fi spots makes it easy to find local Wi-Fi networks. If you download Wi-Fi spot information in advance, you can use it offline and save on communication costs.

Utilizing apps with these functions will make travel and communication smoother and more comfortable while traveling.

6. Summary of how to use your smartphone when traveling abroad

In order to use your smartphone safely and efficiently while traveling abroad, it is important to keep in mind a few important points. First, by properly preparing your smartphone settings and the means of communication you will use in advance, you can avoid high charges and troubles while traveling. Specifically, the key is to effectively combine the use of SIM cards or eSIMs, rental Wi-Fi routers, and flat-rate plans from carriers.

In addition, when using public Wi-Fi, it is important to be aware of security risks and ensure a secure connection by using a VPN, etc. Furthermore, by preparing apps in advance that make it easy to use your smartphone, you can move around and gather information smoothly when you are in the area.

By taking appropriate precautions before traveling, you can use your smartphone safely overseas, avoiding unnecessary costs and troubles, and enjoying your trip comfortably.

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