Japanese SIM Card or eSIM : How to Travel Smart and Stay Online and Connected in Japan
Hey there! So, you’re gearing up for an epic adventure in Japan – sushi feasts, temple visits, Mount Fuji, and maybe a bit of karaoke, right?
Picture this : You’re in the heart of Tokyo, or Kyoto, or whichever Japanese city of your dream, surrounded by the exciting vibe of the city, neon lights flashing, and sushi joints beckoning.
But wait – You realize you’re lost. No Google Maps, no translation app – nada.
Sounds like a nightmare, right? That’s why getting connected to the Internet in Japan via a Japanese SIM card or a pocket WiFi is crucial and practical, and comes highly recommended.

Think about it : with a Japanese SIM card or a pocket WiFi, you’ve got Google Maps at your fingertips, instant translations when you need ’em, attractions and restaurant info accessible whenever you need, and Instagram-worthy snaps to share with your friends back home.
It’s like having a personal tour guide in your pocket, ready to lead you through the complex maze of Japan’s streets and sights.
Now, I know what you’re thinking – SIM cards, pocket WiFi, data plans, tech stuff – sounds like a snooze, right? But trust me, getting this sorted will make your life a whole lot easier as you explore this amazing country.
So, before you jet off on your Japanese jaunt, let’s talk about SIM cards and/or eSIMs. I am going to break it down for you, no jargon, no fluff. Just the lowdown on where to get a SIM card, how to set it up, and everything in between.
And I’ll also cover many Frequently Asked Questions other travelers (just like you!) have wondered.
What Is a Pocket WiFi ?
Now, I have already told you my favorite way to stay connected to the Internet in a previous post. It’s Pocket WiFi (also called a mobile WiFi device)!

If you want to check it out to see if it’s the perfect option for your travel needs, you can find it here at “Travel Smart : Stay Online and Connected in Japan with Mobile WiFi Rental”.
What Is a Japanese SIM Card? And Why Would You Need One When Traveling in Japan ?
Picture a SIM card as a tiny, powerful chip that slots into your phone and hooks you up to the local mobile network.
Now, why should you care? Well, imagine this : You’re wandering the streets of Japan, hunting down the best ramen joint in town. Suddenly, you realize you’re lost.
With a Japanese SIM card in your phone, you’ve got access to Google Maps, translation apps, and all the info you need to easily find your way to that delicious bowl of ramen. And your hotel. And any attractions or spots you have your mind set on.
But it’s not just about avoiding getting lost (although that’s a biggie). Having a Japanese SIM card means you can stay in touch with friends and family back home, share your epic adventures on social media, and even book last-minute tickets or reservations on the fly.
Plus, let’s not forget about the convenience factor. No more scrambling to find Wi-Fi hotspots or relying on sketchy international roaming plans.
With a Japanese SIM card, you’ve got reliable internet wherever you go. It’s like having your own personal hotspot, ready to keep you connected and informed throughout your Japanese adventures.
So, whether you’re a digital nomad, an Instagram aficionado, or just someone who likes to stay connected on the go, a Japanese SIM card is an absolute must-have for your trip.
How Do I Get a SIM Card in Japan for Internet-on-the-Go ?
Now, you might be wondering : Where the heck do I even find a Japanese SIM card? Not a worry, for I’ve got you covered.
Picture this : you’ve just touched down at Narita or Haneda International Airport, jet lagged but buzzing with excitement.
As you make your way through the bustling terminal, keep an eye out for the myriad of kiosks and stores offering SIM cards. From big-name carriers to local providers, you’ll have plenty of options to choose from.
But hey, maybe you’re not the type to leave things to chance – and that’s cool too. In this digital age, you can easily hop online and order a Japanese SIM card in advance, ensuring you are all set before you even step foot in Japan.
Plus, many online retailers offer special deals and discounts for pre-ordering, so you might just snag yourself a sweet deal while you’re at it.
What to Look Out For Before Buying a Japanese SIM Card ?
Now, before you go all in and spend money on that shiny new SIM card, there’s one crucial thing you need to check : Is your phone unlocked?
Yep, that’s right. If your phone is locked to a specific carrier, you’ll need to get it unlocked before you can use a Japanese SIM card.
Don’t worry, though – it’s usually a pretty painless process. Just call up your phone company, and ask to have your phone unlocked. Your future self will thank you for it.
Once you’ve got that sorted, it’s time to play the waiting game. Whether you’re picking up your SIM card at the airport or having it delivered to your doorstep, be sure to pat yourself in the back. You have completed one of the most important tasks needed to ensure a smooth and stress-free Japan vacation. Woohoo!
Installing and Setting Up Your Japanese SIM Card
How to Install Your SIM Card
First things first, let’s talk about installation. Now, if you’ve opted for a physical SIM card (none of that eSIM wizardry), the process is pretty straightforward.
Grab your SIM card ejector tool (or a handy paperclip in a pinch) and pop that sucker into your phone’s SIM tray. The tray should pop out, showing you the SIM slot to insert your SIM card into it. Push the tray back into your phone, and that’s it.

What if you’ve opted for the sleek and modern eSIM route? No physical card required, just a few taps on your phone and boom – you’re ready to rock and roll. Just head on over to your phone’s settings, find the eSIM section, and follow the prompts to activate your new eSIM. Easy peasy, right?
How to Set Up Your SIM Card
Now, onto the fun part – setting up your Japanese SIM card.
For Those Getting a Physical SIM card
Once your SIM card is snug as a bug in your phone, it’s time to fire up the ol’ device and dive into the settings menu. Navigate your way to the network settings section.
Your phone should automatically detect the new network and prompt you to configure the settings.
Just follow the on-screen instructions, enter any required information, and you’re good to go.
For Those Getting an eSIM Card
If you’ve opted for the eSIM, things are even simpler. Your phone will guide you through the setup process step by step, asking for any necessary information along the way.
And that’s it, my friend – you’re officially connected to the digital realm of Japan. With your Japanese SIM card in hand (or nestled snugly in your phone’s digital innards), you’re ready to go forth and explore Japan.
May your internet connection be as swift and reliable as a ninja in the night.
How Are Internet Speed and Data Limits When Using a Japanese SIM Card ?
First up, let’s talk about internet speed. Now, Japanese SIM cards are known for their fast speed. We’re talking good downloading (even though I wouldn’t download large videos), buffer-free streaming, and smooth web browsing.
But, speed is only part of the equation. We also need to talk about data limits. Yep, those pesky little numbers that dictate just how much internet goodness you can consume before you hit the dreaded data cap.
Most companies offer generous data allowances, with multiple packages for all your internet needs, ranging anywhere from 1 GB to 20 GB.
So as long as you are not constantly binging videos at all time, you should be fine.
However, it is always a good idea to keep an eye on your data usage, especially if you’re planning on going full-throttle with your internet adventures.
Most carriers offer handy apps or online portals where you can track your usage in real-time, so you can avoid any nasty surprises when the data cap comes rolling in.
And hey, if you do find yourself approaching your data limit, don’t sweat it – Just purchase another SIM card, and repeat the installing and setting up processes above.
What Is the Cost of Buying a Japanese SIM Card ?
Now, I know what you’re thinking – all this convenience must come at a hefty price, right?
Wrong! Japanese SIM cards are surprisingly affordable, especially when you consider the peace of mind they provide.
Prices vary depending on your data needs and the duration of your stay, but rest assured, you won’t have to sell a kidney to stay connected.
Many SIM card packages go from anywhere around 4.50 USD (for 1 GB of data) up to to 30 USD (for around 20 GB). Very inexpensive!
Some phone companies offer a fixed-rate package, of high-speed internet use, up to 500 MB/day, and you can pay 25 USD for 7-day period, or 30 USD for 15-day period, or 34 USD for a 30-day period.
Pros and Cons of Using a Japanese SIM Card
On the plus side, Japanese SIM cards offer seamless connectivity, fast speeds, and affordable prices. They’re also widely available and easy to install.
However, some travelers may find the initial setup process daunting, or not knowing their phone must be unlocked before arriving in Japan, etc., especially if they’re not tech-savvy.
Additionally, data limits could be a concern for those who are heavy users, or those who have a longer vacation and worried they might run out of data way before the end of their trip.
If any of these issues resonate with you, it might be best to opt for renting a pocket WiFi. It is much easier to set up (turn on, connect, and go!), with unlimited data, high speed, and the rental period can be however short or long as you want it to be.
Pocket WiFi rental cost is also very cheap, and multiple people and multiple devices can share the same network at the same time. great cost saving, right? Find all you need to know about pocket WiFi (or mobile WiFi) in my article here.
Tips for Maximizing Your Japanese SIM Card Experience
To make the most of your Japanese SIM card or eSIM, here are a few handy tips :
- Monitor Your Data Usage : Keep an eye on your data consumption to avoid exceeding your SIM plan’s limits.
- Use Wi-Fi When Available : If needed or running low on data, take advantage of free Wi-Fi hotspots in cafes, restaurants, and hotels to conserve your SIM data.
- Download Maps and Apps Offline : Save maps and essential apps for offline use to navigate without using data.
- Close other unused apps currently running on your phone in the background to avoid wasting your SIM data unnecessarily.
Other Options for Staying Connected to the Internet in Japan
- Pocket Wi-Fi : Renting a pocket Wi-Fi device can provide internet access for multiple devices and people, making it ideal for group travel.

- Free Wi-Fi : Many cafes, restaurants, and public spaces offer free Wi-Fi, but it may not always be reliable or secure.
- International Roaming : Check with your home (phone) carrier about international roaming plans, but beware of potentially high costs. In my personal experiences, the speed was slow and frustrating, even with an international data plan. So it’s best to get a Japanese SIM card or a pocket WiFi.
- Cultural Etiquette : Remember to be respectful of others when using your devices in public spaces, and familiarize yourself with Japanese etiquette regarding technology use (lowering your voice, no speaking on phone in trains and subways, etc.)
Frequently Asked Questions About Using a SIM Card While Traveling Japan
1 . What is a SIM card, and do I need one for my trip to Japan?
A SIM card is a small chip that allows your phone to connect to a local mobile network. Yes, you’ll need one to access mobile data and get online while in Japan.
2 . What do I need to do before getting a SIM card for my trip?
The only thing you need is to make sure that your phone is unlocked before you can use a Japanese SIM card in Japan.
3 . How do I know if my phone is unlocked?
Contact your mobile carrier or check your phone’s settings to see if it’s already unlocked. Alternatively, try inserting a SIM card from another carrier – if it works, your phone is unlocked.
4 . Where can I buy a Japanese SIM card?
Japanese SIM cards are available at any Japanese airports, electronic stores, and online retailers. You can also purchase them in advance and have them delivered to your addres or hotel in Japan upon your arrival.
5 . What’s the difference between a SIM card and an eSIM?
A traditional SIM card is a physical chip that you insert into your phone, while an eSIM is embedded software that allows you to activate a plan without a physical card.
6 . How do I install a Japanese SIM card into my phone?
For a physical SIM card, simply insert it into your phone’s SIM tray (see instructions above).
If you’re using an eSIM, you’ll need to activate it through your phone’s settings.
7 . How do I set up my phone with a Japanese SIM card?
Once the SIM card is inserted, follow the prompts on your phone to configure the network settings.
For eSIMs, you’ll need to activate the plan through your phone’s settings menu.
8 . Can I use my Japanese SIM card in other countries?
It depends on your SIM plan. Some Japanese SIM cards offer international roaming, while others are only valid within Japan. Check before making a purchase, if this is important to you.
9 . What if I need more data or minutes during my trip?
Many carriers in Japan offer multiple packages with extended-use options or top-up options for additional data or minutes.
You can usually purchase these through the carrier’s website or at convenience stores.
10 . Can I keep my current phone number with a Japanese SIM card?
You’ll be assigned a new phone number when you activate your Japanese SIM card. However, you can still receive calls and texts on your original number through call forwarding or messaging apps.
If you phone is one of those with multiple SIM slots, then yes, you can still keep your current phone number, and have a Japanese phone number associated with your Japanese SIM card at the same.
11 . Do I need to return the SIM card after my trip?
No, Japanese SIM cards are typically prepaid and can be disposed of after use.
12 . Can I use a Japanese SIM card in my unlocked smartphone from any country?
Yes, as long as your phone is GSM-compatible and already unlocked, it should work with a Japanese SIM card.
13 . Are there different types of Japanese SIM cards for tourists and residents?
Yes, there are special tourist SIM cards with short-term plans designed for travelers, such as 7-day use, 15-day use, 30-day use, or fixed data plans (1 GB, 5 GB, 10 GB, or 20 GB)
Choose whichever plan or SIM package that works best for your travel needs and data needs.
14 . Can I use a Japanese SIM card for voice calls as well as data?
Yes, most Japanese SIM cards offer voice call and text messaging capabilities in addition to data.
15 . What if I need assistance with my Japanese SIM card?
Many carriers in Japan offer customer service in English, so you can contact them for assistance.
16 . Are there any restrictions on the type of phone I can use with a Japanese SIM card?
No, as long as you have an unlocked phone, you can use a Japanese SIM card just fine.
For those who have concerns about their phones not able to use a Japanese SIM card, and don’t want to wait until arriving in Japan to find out the hard way, the easiest solution is renting a pocket WiFi (mobile WiFi).
This completely eliminates any phone and SIM setups, along with any worries you might have about your phone being compatible with a Japanese SIM card or not.
All you need to do is turn the pocket WiFi device on, connect your phone to its private WiFi network, and voila – You are online!
17 . Can I purchase a Japanese SIM card before arriving in Japan?
Yes, many online retailers offer the option to purchase and have a SIM card delivered to your home ahead of time, or to your hotel in Japan.
18 . Do Japanese SIM cards have expiration dates?
Yes, most Japanese SIM cards have an expiration date, typically ranging from 30 days to several months after activation. Make sure to check the SIM validity period before making a purchase.
19 . Can I use a Japanese SIM card in a device that’s locked to a specific carrier?
No, you’ll need to unlock your device before using it with a Japanese SIM card.
20 . Are there any hidden fees or charges with Japanese SIM cards?
Most of the times, the answer is No. However, it’s essential to review the terms and conditions of your chosen SIM card plan to understand any potential fees or charges, such as activation fees or overage charges.
21 . Can I share my Japanese SIM card’s data with other devices?
Yes, many smartphones allow you to create a mobile hotspot to share your SIM card’s data connection with other devices.
22 . What should I do if my Japanese SIM card isn’t working?
Try restarting your device, checking your network settings, or contacting your SIM card provider for assistance.
23 . Can I use my Japanese SIM card in rural areas or while traveling between cities?
Yes, Japanese mobile networks have extensive coverage, including in rural areas and along major transportation routes.
24 . Is it possible to extend the validity of my Japanese SIM card if I need it for longer than originally planned?
Some carriers might offer options to extend the validity of your SIM card or purchase additional data if needed.
If your carrier doesn’t offer any of these, you can always get a new SIM card when data runs out, go through the same installation and set-up process, and you’ll be good to go.
25 . Are there any specific regulations or cultural norms regarding smartphone use in Japan that I should be aware of?
While smartphone use is common in Japan, it’s essential to be mindful of others in public spaces and adhere to etiquette regarding noise and privacy.
Additionally, avoid using your phone while walking, as it can be considered rude.
If you’re planning a trip to Tokyo, be sure to check out my FREE 2-day Tokyo Japan travel itinerary for an unforgettable experience. Happy travels!
If you have any questions or just want to share your own travel stories, I’d love to hear from you! Please feel free to reach out to me at evelyn@japanoncloudnine.com, and let’s chat. Thank you for taking the time to read my blog post, and happy travels!
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