Photo credit by Vecteezy
Posted on
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By
Clay Thomas
Most of our team lives in Japan, but many of us arrived as visitors or new residents with the same question travelers still ask us. Should we use a physical SIM card, rent a pocket WiFi, or set up an eSIM before leaving home?
We have used all three of these options at different points.
Pocket WiFi was once the most familiar option for visitors, while physical SIM cards were easy to find at airports and electronics stores. More recently, eSIMs have made it possible to arrange mobile data before the flight and connect without collecting or returning another device.
In this article, we'll compare the cost, setup, coverage, data limits, and practical drawbacks of each option so you can choose the one that best fits your trip to Japan.
eSIM
An eSIM is a digital SIM profile that can be installed directly on a compatible phone.
Instead of collecting a physical SIM card or carrying a separate WiFi router, you purchase a plan online and receive installation details via email or the provider's app.
Most travelers can install the eSIM before leaving home and turn it on after arriving in Japan. The phone then connects to a local partner network and uses the eSIM for mobile data while the regular SIM remains in place.
This makes an eSIM particularly convenient for solo travelers and couples who want their own connection. There is no device to collect, charge, or return, and each person can continue using mobile data even when the group separates for part of the day.
The phone must support eSIM and be unlocked by the original carrier. The most recent iPhones, Google Pixel phones, and flagship Samsung Galaxy devices are compatible, though support varies by model and country of purchase.
US versions of the iPhone 14 and later are eSIM-only, making eSIMs the primary way to add a Japanese data plan to those devices.
Most travel eSIMs are also data-only. They provide internet access for maps, train directions, translation tools, social media, and calling apps, but they do not normally include a Japanese phone number or standard voice and SMS service.
Journey Japan eSIM
Journey Japan eSIM is designed specifically for travel within Japan, not for coverage across hundreds of countries.
Our plans connect through NTT Docomo or KDDI, with 4G LTE and 5G service and 99% data coverage across Japan, including many rural destinations outside Tokyo, Osaka, and Kyoto.
The QR code and installation instructions are sent by email immediately after purchase.
You can install the eSIM before your flight, and the plan will connect automatically when you arrive in Japan. This removes the need to visit an airport counter, replace your regular SIM card, or return any equipment at the end of the trip.
We offer both fixed-data and truly Unlimited plans:
Plan | Validity | Current price |
|---|---|---|
10GB | 30 days | $19 |
20GB | 30 days | $29 |
50GB | 30 days | $49 |
Truly Unlimited | 7 days | $29 |
Truly Unlimited | 15 days | $49 |
Truly Unlimited | 30 days | $79 |
The Truly Unlimited plans do not have daily high-speed data limits or reduce your mobile data speed after you cross a daily usage threshold.
This is different from many plans marketed as unlimited that provide a set amount of high-speed data each day before slowing the connection.
Hotspot and tethering are supported across the plans, so you can connect a laptop, tablet, or another traveler's phone when needed.
Unlimited plans have a separate hotspot allowance based on their duration: 15GB with the 15-day plan and 30GB with the 30-day plan.
Customers also have access to 24/7 English-language support and Japan travel perks for luggage storage, restaurants, drinks, karaoke, and other services. These benefits are included alongside the data plan rather than offered as credits toward a future eSIM purchase.
An eSIM is likely the easiest option if you are traveling alone, have an unlocked, compatible phone, and want mobile data ready when you arrive.
Pocket WiFi
Pocket WiFi is a small portable router that connects to a Japanese mobile network and creates a private WiFi connection around you.
Once the device is turned on, phones, tablets, and laptops can connect to it in the same way they would connect to WiFi at a hotel or café.
Unlike an eSIM or physical SIM, pocket WiFi does not require any changes to your phone's cellular settings. Your phone does not need to support eSIM, and it can usually remain locked to your home carrier because it connects to the router over WiFi rather than directly to a Japanese mobile network.
This makes pocket WiFi a useful option for travelers with older or carrier-locked phones. It can also work well for families and groups that plan to stay together throughout the trip.
Pocket WiFi Can Be More Affordable for Groups
Most pocket WiFi devices allow several phones, tablets, and laptops to connect simultaneously.
Some rental models support up to 10 devices, although the connection may slow down when several people are streaming, uploading files, or using data heavily at once.
For a solo traveler, renting and carrying a separate router may cost more than installing an eSIM, but if you are traveling in a group of three or more, you can share the same device.
Pocket WiFi rentals in Japan typically cost ¥550-¥1,000 per day, depending on the provider, plan, rental duration, and included equipment.
That can be less expensive than purchasing separate eSIM plans if you are traveling in groups, particularly when everyone needs a large amount of data. However, the group must remain close to the person carrying the router.
Pickup, Delivery, and Returns
Pocket WiFi normally needs to be reserved before the trip. Depending on the provider, you may be able to collect it at an airport counter, have it delivered to your hotel, or send it to another address in Japan.
Airport pickup is available from many providers at major entry points, including Narita, Haneda, Kansai, Chubu, Fukuoka, New Chitose, and Naha.
At the end of the rental, the device must be returned. Some companies provide a prepaid envelope that can be dropped into a Japan Post box, while others require the router to be returned at an airport counter or another designated location.
Remember to return the router, charging cable, power bank, and any other equipment included with the rental.
Late returns and missing items may result in additional charges.
Battery Life and Charging
Modern pocket WiFi devices generally last much longer than four to six hours. Depending on the model and how heavily it is used, battery life may range from around eight hours to more than 18 hours.
Heavy use, poor signal, and several connected devices can drain the battery more quickly. Some providers include a portable power bank, while others charge extra for one.
You will still need to remember to charge both the router and any backup battery each night. If the pocket WiFi runs out of power during the day, all devices connected to it lose internet access at the same time.
Data Limits and Connection Speed
Pocket WiFi and eSIMs often connect through the same Japanese carriers, so one is not automatically faster than the other.
Speed depends on the network, location, signal strength, plan terms, and the number of devices sharing the connection.
Plans advertised as unlimited may still have a fair-use policy. Some reduce speeds after a certain amount of data is used in one day or over the full rental period. Check the provider's high-speed data allowance rather than relying only on the word "unlimited."
The connection may also slow when several people use the router at once. Maps and messaging require relatively little data, but multiple devices streaming video or joining video calls can place more pressure on the shared connection.
Loss, Damage, and Insurance
Because pocket WiFi is rented equipment, you may be responsible for it if it is lost, stolen, or damaged. Replacement charges can be significant, and some providers charge separately for a lost router, cable, case, or power bank.
Rental companies often offer optional insurance for an additional daily fee. Before booking, check what the insurance covers, whether there is still a deductible, and how much you would owe without it.
Pocket WiFi can be a better choice for a family or group that will stay together, travelers with locked or eSIM-incompatible phones, or anyone who wants to connect several devices on one plan.
For a solo traveler or a group that expects to separate regularly, an eSIM is usually easier because each person keeps an independent connection.
Physical SIM Cards
A physical SIM card is a small removable chip that you insert into your phone to connect directly to a Japanese mobile network. Tourist SIM cards are available online, at major airports, and from electronics stores throughout Japan.
Unlike a pocket WiFi, a physical SIM does not require you to carry or charge another device. Once installed, your phone connects to the network automatically, much like it would with an eSIM.
Your phone must be unlocked and have a physical SIM tray.
US versions of the iPhone 14 and later are eSIM-only, so they cannot use a physical Japanese SIM. Older iPhones and many Android phones still include a SIM tray, though compatibility varies by model.
Installing a Physical SIM
Physical SIM cards are purchased rather than rented, and most travelers can install one without professional help. You remove your regular SIM, insert the Japanese SIM, and follow the provider's setup instructions.
Some plans work automatically, while others require you to enter an APN, which tells the phone how to connect to the provider's network. The necessary settings are normally included with the SIM card.
You will also need somewhere safe to store your regular SIM while it is out of the phone. Losing it during the trip could make it difficult to reconnect to your home carrier when you return.
Travelers using dual-SIM phones may be able to leave their regular SIM installed and place the Japanese SIM in the second slot. Support varies by phone model.
Data-Only SIMs and Japanese Phone Numbers
Many tourist SIM cards sold in Japan are data-only. They provide internet access for maps, translation tools, messaging apps, and online calls, but they do not include a Japanese phone number for regular calls or SMS messages.
Some providers sell voice-and-data SIM cards with a Japanese 070, 080, or 090 number. This can be useful for longer stays, business travel, restaurant reservations, delivery services, or accounts that require verification through a Japanese number.
Voice plans usually cost more and may require additional registration. Travelers who only need internet access will generally find a data-only SIM or eSIM easier.
Cost of a Physical SIM in Japan
Prices vary based on the provider, validity period, and amount of data included. Short-term tourist SIMs can begin at around ¥2,000 for a small data allowance, while higher-data or unlimited plans may cost ¥5,000 to ¥10,000 for several weeks.
A physical SIM can be reasonably priced for one traveler, but each person in a group normally needs a separate card. It may therefore cost more than sharing a pocket WiFi when several people are traveling together.
Check whether the plan allows top-ups before purchasing it. Some physical SIMs expire once the data allowance is used up, while others let you buy additional data online.
Buying a SIM Before or After Arrival
Ordering before your trip gives you time to confirm that the SIM is compatible with your phone and review the setup instructions. Depending on the provider, the card may be delivered to your home, hotel, or an airport pickup counter.
Buying after arrival gives you more flexibility, but you will need to find a store or counter to connect. Airport SIMs are convenient, although the available plans may be more limited or expensive than those sold online.
A physical SIM is most useful for travelers with an unlocked phone that does not support eSIM, or for someone who specifically needs a Japanese phone number.
For most travelers with a compatible device, an eSIM provides similar mobile data without removing the home SIM or handling a small physical card.
Which Option Is Best for Your Trip to Japan?
The best way to stay connected in Japan depends less on which option is newest and more on how you plan to travel.
An eSIM is the easiest choice for most travelers, while a pocket WiFi can be more practical for a family sharing several devices.
For Solo Travelers
An eSIM is usually the simplest option for a solo traveler with an unlocked, compatible phone.
You can install it before departure, connect after arrival, and keep your regular SIM in place.
You also do not have to collect or return a router, carry another device, or worry about staying close to someone else's connection.
For Couples
Couples can either purchase separate eSIMs or share one pocket WiFi.
Separate eSIMs usually cost more, but each person keeps an independent connection when they split up for shopping, sightseeing, or different activities.
A pocket WiFi may cost less if both travelers expect to remain together throughout the trip.
The drawback is that the person carrying the router must stay nearby for the other phone to remain connected.
For Families and Larger Groups
Pocket WiFi often becomes more cost-effective when three or four people share the cost. One router can connect several phones, tablets, and laptops, which may cost less than purchasing individual eSIMs for each traveler.
This works best when the group plans to stay together.
Families should also consider what happens if one person leaves the hotel with the router while someone else remains behind or travels separately.
For Travelers with Locked or Older Phones
Pocket WiFi is often the safest option when a phone is still locked to its home carrier or does not support eSIM.
Since the phone connects over WiFi, there is no need to replace the SIM or install another mobile plan.
A physical SIM may also work on an older phone, but only if the device is unlocked and supports the provider's Japanese network bands.
For Travelers Who Need a Japanese Phone Number
Most travel eSIMs and tourist SIM cards are data-only.
They work for maps, messaging apps, and internet calls but do not provide a Japanese number for standard calls or text messages.
Travelers who need a local number for business, deliveries, reservations, or SMS verification should look for a physical voice-and-data SIM.
These plans are less common and may require additional registration, so it is worth arranging one before the trip.
For Business Travelers
An eSIM is usually the most practical option for business travel.
It provides the traveler with an independent connection, works while traveling between meetings, and can often be used as a hotspot for a laptop or tablet.
Pocket WiFi can still make sense when several colleagues need to share a single connection, but it becomes problematic when the group splits up or when members attend meetings in different locations.
For Heavy Data and Multi-Device Use
Travelers who regularly connect multiple devices may prefer pocket WiFi, especially when the rental includes a generous high-speed data allowance.
A phone plan with hotspot support can also work, but the hotspot allowance may be separate from the phone's main data allowance.
Check the fair-use policy for any plan described as unlimited. Both eSIM and pocket WiFi providers may reduce speeds after a daily or total usage limit, even when the plan name suggests there is no cap.
For most solo travelers and couples, an eSIM offers the easiest balance of independence and convenience.
Pocket WiFi becomes more appealing for groups that stay together, while a physical SIM remains useful for older phones and travelers who need a Japanese number.
Stay Connected in Japan with Journey Japan eSIM
Pocket WiFi, physical SIM cards, and eSIMs can all provide reliable mobile data in Japan. The best choice depends on the phone you are bringing, the number of people traveling with you, and whether you need an independent connection or a Japanese phone number.
Pocket WiFi may be more affordable for a family or group that plans to remain together, while a physical SIM can work well for an unlocked phone without eSIM support. For most solo travelers and couples with compatible phones, an eSIM is usually the easiest option because it can be installed before departure and does not require any equipment to collect, carry, or return.
Journey Japan eSIM offers plans created specifically for travelers visiting Japan. You can install your eSIM before your flight, keep your regular SIM in place, and connect to a local network after you arrive.
Our plans use leading Japanese networks and provide nationwide coverage, including destinations beyond Tokyo, Osaka, and Kyoto. Fixed-data plans are available for lighter use, while our Truly Unlimited plans have no daily data caps or speed throttling. Hotspot sharing is also available on eligible plans.
Customers receive 24/7 English-language support and access to partner discounts on luggage storage, restaurants, drinks, karaoke, and other services during their trip.
Choose a Japan eSIM plan before you travel and arrive ready to use maps, train directions, translation apps, booking details, and everything else you need to explore Japan.
