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Japan Unlimited Data SIM Card (15 / 31 Days | No Daily Limit | KDDI)

5.0|Based on 6 Reviews5 out of 5 stars based on 6 reviews
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Important Information

IMPORTANT: Competitors advertising "Unlimited Data for Japan" without addressing any limits or throttling may be misleading. If you find ambiguous language regarding potential data slowdowns attributed to factors beyond their control and assurance speeds will normalize the next day, it typically indicates the presence of an undisclosed daily usage caps. We strongly advise reaching out to them directly or thoroughly reviewing their website to clarify these restrictions. Our Unlimited Japan Data SIM Card has No daily data caps and is purely unlimited.

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Recent Reviews

Philip N.

We ordered an eSim and

We ordered an eSim and a physical SIM for our trip to Japan. Unfortunately, the physical SIM wasn't compatible with my phone (my fault, I should have checked, as advised) but it did work in my wife's phone. I contacted SimCorner immediately and, although it was late at night, they responded immediately. They agreed to refund our eSim, as it hadn't been activated and we relied on the physical Sim, which worked perfectly in Japan. It's a 5G Sim and the download speed were amazing at all times, but older phones may not work, so do more research than I did before purchasing.

Kay F.

Bought a 31 days Sim

Bought a 31 days Sim card for Japan and advised activation date would be 6th Nov 2025. When Sim arrived it had a sticker saying - please activate before 16th Nov 2025. Thought all good as I would be activating on 6th Nov. Think again - 16th Nov comes and the Sim card stopped working. Luckily had just arrived at new accommodation and was able to connect to WiFi so I Contacted SimCorner Support as per the paperwork. Problem was solved quickly as the phone I was using did have the possibility of eSim so they sent me QR code to activate an eSim. Worked perfectly for the rest of the trip. Thanks for the quick response

Andrew B.

Easy to Use. Very successful

Easy to Use. Very successful data use in Japan.

WENDY A.

I got this for my

I got this for my grandson when he did a study tour in Japan. It worked perfectly for him, wherever they travelled.

How to Activate Japan SIM Card?

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  • 1

    Follow the instruction

    Follow the activation process as per the instruction sheet.

  • 2

    Insert your SIM Card

    Make sure your phone is turned off. Insert your SIM card into the SIM tray.

  • 3

    Turn on your phone

    Power on your device and wait for it to recognise the SIM card.

  • 4

    Confirm network connection

    You should see signal bars or a network name at the top of your screen.

  • 5

    Set up your phone

    Once activated, your device may prompt you to configure settings or install updates.

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Japan SIM Card FAQs: All You Need to Know

Everything you need to know about SimCorner’s SIM and eSIM services for a hassle-free travel. View all FAQ

SimCorner is your trusted global provider of travel eSIM and SIM cards. We offer affordable, hassle-free plans with options for data-only or data with calls and SMS, covering 200+ destinations. Order our prepaid SIM cards online for fast delivery to your doorstep, or choose an eSIM for instant purchase and easy activation. With our unmatched coverage and award-winning customer support, you can explore the world with confidence wherever your travels take you.
Make sure that your device is unlocked before you depart for your trip. Please note: Being on a post-paid plan or contract with your local carrier doesn't mean your phone is locked. If you are unsure, please check with your current service provider.
You can keep track of your Data usage through your phone's data usage function (found in Settings).
Japan
The mobile data APN settings should automatically update when you insert the sim in you phone. If it does not, you need to update the settings as noted in the instructions provided.
Depends on the SIM purchased you can either have 15 days or 31 days of service. Your days of service will start when the SIM is connected to a network. This will be the day that your service commences.
This sim cannot be recharged. Please ensure you purchase the correct duration based on how long your trip is for. Your days of service will start when the SIM is connected to a network in Japan. This will be the day that your service commences.
Should you run into any issues with the sim whilst overseas then we encourage you to email us immediately at support@simcorner.com and let us know the following information; Your order number or the name that the order is under along with the SIM number and phone number. Which country you are in currently and whether the sim connects to any network, if so, which network? Did you receive any SMS after you inserted the sim? If so, please send us a screenshot of that message. Message us screenshots of any error message you are getting. What phone model you are using? Any other information about the issue, which will assist us in helping you resolve the issue.
You can stay in touch with your family and friends by sending them messages and calling them via data based apps such as Whatsapp, Viber, Snapchat, Messenger, Skype, iMessage etc. You are also able to add credit to your Viber or Skype account, which will allow you to make local and international phone calls directly to landlines and mobiles.
You can stay in touch with your family and friends by sending them messages and calling them via data based apps such as Whatsapp, Viber, Snapchat, Messenger, Skype, iMessage etc. You are also able to add credit to your Viber or Skype account, which will allow you to make local and international phone calls directly to landlines and mobiles.
Yes, you will have access to all your apps, messages, contacts and emails whilst using this Japan SIM card. Nothing on your phone is deleted or changed and you can continue to use your phone as per normal. 
Order your travel SIM online and select the delivery method that best suits your travel date. SimCorner delivers to many countries across the world and has dispatch locations in Australia, Canada, New Zealand and United Kingdom. Receive your Japan SIM card in the mail prior to departing for your trip. Insert your Japan SIM card in your phone as soon as you land and stay connected.
This is a data only SIM. It does not come with a phone number.
Yes, you are able to hotspot/tether from your phone to another phone or device. The total hotspot limits vary by plan; they are noted below: 15 days – 15GB 31 days – 30GB
Once the SIM is loaded, you simply need to have both MOBILE DATA and DATA ROAMING functions ENABLED/TURNED ON in your phone to use the service. If you face issues, then you might need to update the APN Setting in your device as noted in the booklet.
This SIM can connect to different network partners in the country
If you are travelling for longer than 31 days, please purchase multiple sims accordingly. For example, if you are travelling for 45 days then purchase 2 of these sims and swap them over at the end of the 31 day period.
Should you run into any issues with the eSIM whilst overseas then we encourage you to email us immediately at support@simcorner.com and let us know the following information; Your order number or the name that the order is under Which country you are in currently and whether the eSIM connects to any network, if so, which network? Did you receive any SMS after you installed the eSIM. If so, please send us a screenshot of that message. Message us screenshots of any error message you are getting. What phone model you are using? Any other information about the issue, which will assist us in helping you resolve the issue.
You are not able to send SMS and make phones calls with this Japan SIM Card. We recommend that you use data based apps such as Whatsapp, Viber, Skype to send messages to friends and family.
Yes, if you purchase 2 Japan SIM cards then you will be able to contact each other via data based apps such as Whatsapp, Viber, Snapchat, Messenger, Skype etc.
We have a 100% Money Back Guarantee policy, which means that if you have a bad experience with one of our sim card and receive no value from it, we will provide you a refund. However, you MUST contact us whilst you are having the issue, so our team can assist you in resolving your problems. Please do this when you are in WiFi (generally at the airport when you land if not working to begin with) or e-mail us from your accommodations (WiFi) or cafe etc. If you only decide to contact us after you return to let us know the sim didn't work then we can't look to provide a refund as we won't be able to see exactly what the issue was and why it didn't work. Should you run into any issues whilst using the sim card, please immediately contact us at support@simcorner.com Should our team be unable to assist you in resolving your issue, then we will provide you a refund on your purchase.

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Japan Unlimited Data SIM Card (no daily limit) | KDDI

Travel hassle-free in Japan with our Unlimited Data SIM for 15 or 31 Days. Best of all, it is truly unlimited, so no daily limit! Enjoy blazing fast internet upto 1000Mbps download speed for navigation, streaming, and staying connected without worrying about roaming fees or SIM card swaps. Get your KDDI SIM card Japan Unlimited data today and go explore Japan!

Included Features Summary:

  • Country Coverage: Japan 
  • Data: Unlimited Data (no daily limit)
  • Data Speed: 4G/5G Data speeds
  • Calls: Not included
  • Texts: Not included
  • Phone Number: Not Included
  • Hotspot/Tethering: Varies by plan – 15 days (15GB); 31 days (30GB)
  • Validity: 15 or 31 Days of service from activation

 

  • Device Compatibility: Can be used with unlocked mobile phones. For compatibility details, please see the "Compatibility" section in "Things to know" section
  • When to install: Upon arrival at your destination
  • Activation: Please see "How to activate this SIM card" in the "Things to know" section

 

IMPORTANT: Competitors advertising "Unlimited Data for Japan" without addressing any limits or throttling may be misleading. If you find ambiguous language regarding potential data slowdowns attributed to factors beyond their control and assurance speeds will normalize the next day, it typically indicates the presence of an undisclosed daily usage caps. We strongly advise reaching out to them directly or thoroughly reviewing their website to clarify these restrictions. Our Unlimited Japan Data SIM Card has No daily data caps and is purely unlimited.

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