The Ultimate Guide to Staying Connected in Japan: Roaming, SIM, or eSIM?

If you're planning a trip to Japan, booking flights and accommodation are a must. But just as important is figuring out how you'll stay connected on your smartphone. To look things up and make reservations while you're in Japan, you'll need to have a reliable way to get online.

Your options for mobile internet in Japan include relying on your home carrier's roaming plan, purchasing a local SIM card or eSIM, or renting a Pocket WiFi device.

This article will focus on the first three options:

1. International Roaming
2. SIM Card (Physical SIM)
3. eSIM

Many people wonder, "Which of these is the most convenient and affordable way to get connected in Japan?"

You might have a general idea that buying a SIM or eSIM seems complicated to set up, and international roaming can be expensive. This article breaks down the features of each option to help you decide.

    

Roaming, SIM, or eSIM: Understanding the Three Options

First, let's go over the basics of each connectivity method.

International Roaming

This method allows you to use your regular mobile service overseas without changing your SIM card.

• Pros:
  • It's incredibly easy. It requires almost no special setup, and you can continue to use your usual phone number and apps.
  • No need for preparation before you leave or procedures upon arrival.
• Cons:
  • Can be expensive. Unexpected data usage can lead to a shockingly high bill.
  • You need to check your plan's rates and monitor your data usage carefully.

SIM Card (Physical SIM)

This method involves inserting a data-only SIM card from a Japanese carrier into your smartphone.

• Pros:
  • Affordable. You can choose from various plans based on data volume and duration.
  • The connection is often stable and fast, providing a smooth internet experience.
• Cons:
  • Requires swapping SIMs. You have to open your phone's SIM tray and replace the card.
  • You must be careful not to lose your original SIM card.

eSIM (Embedded SIM)

An eSIM is a digital SIM built into your smartphone, so you don't need a physical card.

• Pros:
  • No swapping needed. Setup is easy and done entirely online, usually by scanning a QR code.
  • Use multiple eSIMs. This is convenient for separating personal and work lines or for traveling to multiple countries.
• Cons:
  • Limited device compatibility. You can only use an eSIM on compatible devices, such as the iPhone XS and newer or certain Android phones.
  • You need a Wi-Fi connection to set it up.

 

Which Option Is Right for You?

Now that you understand the three choices, let's figure out which one fits your travel style best. Use the table below for reference.

The best connectivity option for a trip to Japan depends on your situation and how you plan to use your phone, but we recommend an "eSIM."

eSIM

Reasons to Choose It

Convenience: You don't need to swap out a physical SIM card. The entire process, from purchase to setup, can be done online, so you're ready to go before you even land in Japan.
Flexibility: You can have multiple eSIMs on your device, allowing you to use your travel plan and your home line simultaneously. For example, you can use a Japanese data eSIM while keeping your home phone number active on your physical SIM (or another eSIM). This ensures you won't miss important calls or messages.
Cost-Effective: Many carriers offer eSIM plans for travelers to Japan. You can also choose a plan that fits your trip duration and data needs.
No Risk of Loss: Since there's no physical card, you don't have to worry about losing or damaging it.

Cons

Limited Device Compatibility: eSIMs only work on relatively new smartphones (iPhone XS and newer, Pixel 3 and newer, etc.).
Setup can be tricky: Some people might find the initial setup confusing, as it requires scanning a QR code.
How to Quickly Check if Your Smartphone Can Use a Japanese eSIM in 5 Seconds

SIM Card

Reasons to Choose It

Wide Device Compatibility: Physical SIMs work on older phones that don't support eSIM.
Familiarity: For those who are not comfortable with eSIM setup, a physical card is a straightforward option. You can buy them at airports, electronics stores, and convenience stores.

Cons

The Hassle of Swapping: You need to physically swap out your SIM card. Be careful not to lose your original SIM.
Limited Availability: Unlike eSIMs, you can't buy a physical SIM just anywhere, anytime. You have to find a specific store that sells them.

International Roaming

Reasons to Choose It

Easy to Use: No special setup or SIM card swap is needed. You can use your regular SIM card to get connected in Japan.

Cons

High Cost: If you don't have an international roaming plan, data usage can lead to extremely high charges. You could end up with a huge bill after watching a video or updating an app.
Unstable Speed and Connectivity: Depending on the local carrier's network, speeds might be slow or unreliable.
Data Limits: Roaming plans often have strict data limits, so you have to be careful about your usage.

Recommended eSIM Services for Japan Travel

Here are some recommended eSIM services for traveling in Japan. These services provide reliable connectivity in rural areas and offer ample data capacity. Additionally, since they connect to Japan’s local networks, their connection speeds are more stable and reliable compared to roaming services.

Preparing for Your Trip to Japan: FAQ

Q1. Can't I just use Wi-Fi in Japan?

There is free public Wi-Fi available at airports, hotels, and major train stations, but it's not available everywhere. Many places you visit, especially while you're on the move, won't have Wi-Fi. It's highly recommended to have a dedicated way to get online.

Q2. How much data do I need?

If you're mainly using your phone for social media, maps, and simple web searches, 1GB per day should be plenty. If you plan to stream videos or play online games, you'll need more data. Consider an unlimited plan if you're worried about running out.

Q3. Where can I buy a SIM card?

You can purchase them at major Japanese airports, electronics stores, and some convenience stores. It's also possible to buy one online and have it shipped to a friend's or family member's address in Japan.

Summary: Choose the Best Option for a Stress-Free Trip to Japan!

In this article, we compared three ways to get online while traveling in Japan: roaming, SIM cards, and eSIMs.

• For ultimate convenience → International Roaming
• For the lowest price and high data usage → SIM Card
• For a perfect balance of convenience and affordability, without having to swap SIMs → eSIM

Choose the best option for your travel style and device. By preparing ahead of time, you can make the most of your trip to Japan!