Avoid Wasting Data: When to Activate Your eSIM for Japan

For those planning a trip to Japan, many are likely considering purchasing an eSIM as a way to stay connected. We've received numerous emails asking, "When's the right time to install an eSIM?" This article will answer that question and provide a detailed explanation of eSIM basics and the optimal installation timing.

What is an eSIM? How Does it Differ from a Traditional SIM?

An eSIM (embedded SIM) is a digital SIM card that's built into your smartphone. Unlike physical SIM cards, an eSIM is integrated into your device, so there's no need to swap out cards. You can activate communication simply by scanning a QR code or downloading a profile via a dedicated app.

Especially when traveling internationally, an eSIM eliminates the hassle of finding a local SIM card, making it an attractive option for many travelers.

Pay Attention to Installation and Activation Timing

When using an eSIM, it's crucial to be aware of the timing for both installation and activation. For many eSIM services, the validity period of your communication plan begins the moment you install the profile on your device.

Therefore, if you accidentally install it before you depart for Japan, the clock will start ticking even though you haven't used any data yet. This could potentially reduce the number of usable days during your actual stay. This is particularly important if you've chosen a short-term data plan (e.g., 5 days, 7 days, etc.).

3. Installing Upon Arrival in Japan is Safest

Regardless of the provider you use, the general rule is to "install and activate your eSIM after arriving in Japan, using Wi-Fi at the airport or other locations."

For example, with Travel Mobile, your communication plan begins the instant your eSIM is installed and active, so we recommend setting it up after you arrive in Japan. You can easily install by logging into My Page, where you'll find your QR code and setup information. You can also check your data usage in real-time on the same page, which is helpful for managing your data consumption.

Recommended Steps

1. Purchase your eSIM before departing for Japan
   Buying your plan online in advance ensures peace of mind, as you can start using it immediately upon arrival. After purchase, you'll receive a QR code or setup link via email, so be sure to keep it safe.
2. Install the eSIM while connected to Wi-Fi upon arrival in Japan
   Install your eSIM profile in a location with Wi-Fi, such as an airport or hotel.
3. Set the eSIM as your preferred line in your mobile settings
   In your smartphone's settings, set your eSIM as your primary data line.
4. Confirm that communication is working correctly
   Check if you can access websites, if apps are working, and so on.
5. Additional Notes for Travel Mobile Users
   If you're a Travel Mobile user, you can log in to My Page to re-display your QR code and setup information. Furthermore, you can check your remaining data and usage status.

While eSIMs are incredibly convenient tools, installing them at the wrong time can sometimes lead to not being able to fully utilize your communication plan. If you want to make the most of your data during your trip to Japan, the key is to "install it after you arrive in the country."

Refer to specific examples like Travel Mobile and make sure to follow this principle with your own plan. By following the correct steps, your internet connection during your stay in Japan should be comfortable and reliable.