Esim VS pocket WiFi? – Which is better for your trip to Japan!

In today’s world, traveling abroad and disconnecting from the world isn’t an option anymore. There’s always a need to be online – The Swipe Generation must have a connection to Instagram at all times, and the Zoom zombies who are always available at work need a reliable internet connection, even when abroad. But the question is, which product is better, eSIM VS Pocket WiFi, or maybe a traditional SIM card? With so many options, from portable WiFi devices (Pocket WiFi or MiFi) to modern digital SIM solutions (eSIM), deciding what’s ideal for your travel needs can be tricky. This article will help you make the right choice.

Contents

Introduction

Contents

Do you need to be online in Japan?

How to get internet in Japan?

Japan SIM card

Japan eSIM

Roaming

Public WiFI

Japan Pocket WiFi

SIM vs eSIM vs Pocket WiFi — Comparison Table

Conclusion

FAQs

Do you need to be online in Japan?

Staying online in Japan may or may not be a must for you. To make your trip easier, having access to data will make your days more straightforward. Data is essential for navigating public transport in Japan; you will need to stay up to date with the live train times and which train to get. Additionally, being online will allow you to use apps like Google Translate and Google Maps. This isn’t only helpful in major cities like Tokyo or Kyoto, but also invaluable when visiting various tourist attractions throughout Japan.

How to get internet in Japan?

Getting online in Japan is easier than ever, thanks to a variety of options like eSIMs, Pocket WiFi, SIM cards and even free public hotspots in major cities. Whether you’re navigating the subway or translating menus, staying connected can make your trip smoother and more enjoyable. Before choosing an internet option, make sure your phone will work in Japan ➝ Will my phone work in Japan?

Japan SIM Card

Since the 90s, most people have reached for a SIM card when traveling, but since then, we have seen the Mini-SIM, the Nano SIM, and now the eSIM. The world of technology saw a need for convenience; physical SIM Cards mean hassle. You need to physically change your SIM, which will be delivered to you, and the activation process can take some time. When is a physical SIM Card a good choice? if your smartphone currently has just one SIM card inserted and a second empty SIM slot, ordering a physical SIM in advance makes perfect sense. You can insert it into the spare slot before your trip, and the moment your plane touches down in Japan, you’ll be connected — no delays, no airport Wi-Fi hassle, no setup stress. Just land and go!

What are the Pro’s and Cons of a Japan SIM Card?

✅ Pros

Affordable data compared with roaming and pocket Wi‑Fi. Examples:
- 10 GB SIM for ¥2,600 (~£14–£15) from Amazon or airport vendors
- Unlimited data plans (~¥4,500–¥6,500, about £25–£35) via providers like Sakura Mobile or NINJA WiFi
Easy setup & no extra device: Insert into your unlocked phone, configure APN, and go—no battery to charge or equipment to carry.
Wide availability: Cards sold at airports, electronics stores (e.g., Bic, Yodobashi), convenience stores, or rented online for airport pickup
Variety of plans: You can choose from small data amounts (1–3 GB) to unlimited options and durations (e.g., 7, 14, 30 days) .

⚠️ Cons

Need an unlocked phone: Locked devices (e.g., some US carriers) can’t accept foreign SIMs
Physical swap required: Must remove your home SIM—bring an ejector tool, and don’t misplace anything .
Single-device use: Only works in one phone. To share data, you’d need tethering, which may be limited or slower .
Limited validity: Tourist SIMs usually last 7–30 days—longer stays require purchasing another

Japan eSIM

An Esim is an embedded SIM Card, already built into your device. An Esim is a digital version of a SIM Card. However, opting for an eSIM comes with no physical hassle, it’s all done digitally. Japan eSIM cards offer flexible plans, nationwide coverage, and sometimes a native phone number.

Here are some pros and cons of using an eSIM in Japan:

✅ Pros

Convenience: Easily switch between carriers without needing a physical SIM card
Space-saving: No need for a SIM card slot, freeing up space in your device
Flexibility: Manage multiple accounts and carriers on one device
Quick Setup: Activate your eSIM by scanning a QR code, making it hassle-free
Cost-effective: Avoid hefty roaming fees by using local carriers

⚠️ Cons

Compatibility: Not all devices support eSIMs, so check your device’s compatibility
Limited Data Plans: Some eSIM plans may offer less data compared to physical SIM cards
Network Stability: Depending on the provider, eSIMs might have slower speeds compared to physical SIM cards.
Availability: eSIMs might not be available from all carriers, limiting your options

Data roaming

Data roaming is a convenient option for short trips, especially if you only need a limited amount of data each day. However, using your home network provider’s roaming service can be costly. Most carriers charge a daily flat rate, these rates can start at $10 – which can quickly add up depending on how long you are travelling for! Not only will this cost $100 for one week of data, you may not have access to data all day. Many providers will cap their data allowances when you travel overseas.In contrast, local SIM cards, such as those from Mobal, offer substantially more data at a lower total cost—30GB for around $32. Additionally, you may also experience slower data speeds, and inconsistent coverage due to Japan’s unique mobile infrastructure. Overall If you are a traveller who will rely on , google maps, translate or need to be available for work calls, these factors are worth considering when choosing between roaming and local alternatives.

Public WiFi in Japan

Or there’s Free WiFi! Which is great for your wallet but not so reliable either. While major cities like Tokyo have lots of free spots to get online, when travelling outside of the urban centres, you might struggle to find any internet, let alone free internet.

Free WiFi Availability – Location Breakdown:

Reliable Free WiFi	No	Yes
Cafes/restaurants
Convenience Sores
Tourists attractions
Trains Stations
Airports
On public transport
Ryokan (traditional inns)
Country Side
Hotels

A key concern for most travellers who rely on public Wi-Fi is the security risks associated with it. Public networks are often unsecured, making it easy for cybercriminals to intercept data transmitted over them. Meaning your sensitive information such as passwords, banking apps, and personal emails are easy to for cyber criminals to get access to! To mitigate these risks, users should avoid accessing sensitive accounts on public WiFi, use virtual private networks (VPNs), and ensure their devices have updated security software.

Japan Pocket WiFi

To ensure a safe and seamless experience, avoiding the need to spend your days searching for an internet connection, Pocket WiFi is also a viable option for your trip to Japan. Reliable, portable internet in your pocket! To browse your Japan Pocket WiFi option, have a look at this blog –Best Pocket Wi-Fi in Japan: Compare the Options | Tokyo Cheapo

Pocket WiFi Japan

A Pocket WiFi device is a battery-powered, portable wireless router. They connect to the internet via your phone’s network, that being either 4G or 5G. The main selling point of this device is its multiple connectivity purposes, making it ideal for those planning to work abroad and needing to use multiple devices simultaneously. Or for digital nomads and large groups of 5 or more! What else are the pro’s of Japan Portable WiFi?

Pocket WiFi can work with almost any phone and your mobile device doesn’t have to be unlocked. (Don’t know if your device is unlocked? Head over to this article to find out more!)
Multiple devices can be connected to one MiFi. Making this an excellent option for those family vacations or corporate cyborgs.
It’s Portable! Most Pocket WiFi devices you see online, can fit in your pocket. This means you don’t only get an internet connection at home but all over Japan.

Speed and coverage from a Pocket WiFi.

Speeds:

Japan Pocket WiFi boxes can offer up to 300GB of data with speeds of 50Mbps upload speeds and 150Mbps download speeds – these speeds are more than enough for online gamers and streamers.

Coverage:

Japan’s leading mobile networks operate on 4 G LTE, comprising NTT Docomo, Softbank, and au by KDDI. As long as you’re in Japan and your WiFi is in your pocket, you will be connected on a national scale.

What can affect Pocket WiFi speeds?

There are a few factors to keep in mind when opting for a pocket WiFi device for reliable, fast internet, one being these:

Multiple devices being connected – pocket wifi is affected by bandwidth, the router being shared between multiple devices can make the internet slower.

The cost of Japan Pocket WiFi?

The average cost of renting a Pocket WiFi device in Japan can vary depending on the available plans. These plans include the duration of use and the data allowance, and some providers may ask for a damage protection fee.

If you plan to stay in Japan for an extended period, your costs will start at around ¥5,000. On the other hand, for short durations, you can purchase a portable WiFi router with 1GB for around ¥400 a day.

Japan eSIMs

An eSIM is a digitally embedded SIM Card offering a hassle-free data experience anywhere. Built into your device, they can be activated through a QR code, an access code provided by the provider, or an app—the more trendy and easier option. There are a few pros to opting for an eSIM.

Instant activation
Switch easily between plans
Flexible data plans
No set-up process

Speed and coverage from a Pocket WiFi.

Speeds:

Esims connect directly to Japan’s cellular networks, meaning you will be receiving faster speeds than a WiFi router can offer.

What can affect Japan Esim speeds:

An advantage of eSIM is that your data connection will generally be stable.

Similar to the Pocket WiFi, using your eSIM to hotspot other devices will slow down your internet speed.

Coverage:

Japan Esims have 99% coverage – eSIM plans often allow you to connect to multiple local carriers or switch between them if signal strength varies..

The cost of a Japan Esim?

As eSIMs offer more flexibility regarding data usage and the duration of use, plans can start at a relatively low price. Plans as little as 1GB for 7 days can start at around $4, which translates to approximately ¥580.

Slightly larger plans for long-term users may have a starting price of $84, roughly translating to ¥12,300. These plans are great for those staying in Japan longer than 30 days. If you’re traveling for work or visiting family, this may be the price you’re looking at.

Let’s look into to these products a little more - head-to-head:

Free WiFi Availability – Location Breakdown:

	eSIM	Pocket WiFI
Pick-up	No	Typically Yes
Extra Device	Not needed.	Yes.
Returning the device.	Not needed.	Most carriers will ask for the device to be returned at the end of your paid plan.
Batter powered device	No	Battery-powered device that typically lasts 6–12 hours and may require recharging during the day.
Plans	Customizable plans with various data amounts and durations.	Fixed plans with limited data options and set time periods.
Device Compatibility	Works with any unlocked phone.	Works with any WiFi-enabled device.

Which is better for your trip to Japan?

Ultimately, choosing between eSIM and Pocket WiFi comes down to your specific travel needs. If you’re a solo traveller looking for convenience and instant setup, an eSIM is a lightweight, hassle-free solution. But if you’re travelling in a group, need to connect multiple devices, or plan to work remotely, Pocket WiFi offers more flexibility and shared coverage. The best option is the one that suits your travel style.

FAQ’S?

Does my phone need to be unlocked for a Japan eSIM?

= Yes, your phone must be unlocked to use a Japan eSIM. If your device is locked to a specific carrier, it won’t be able to connect to Japanese networks via eSIM. Read online here to find out how to unlock your phone – How to unlock my phone for free for any network

Does my phone need to be unlocked for a Japan Pocket WiFi?

= No, your phone does not need to be unlocked to use a Pocket WiFi in Japan. Pocket WiFi devices function as portable routers, allowing any WiFi-enabled device, regardless of its lock status, to connect to the internet.

Can I receive texts or calls with an eSIM?

= Yes, you can make and receive texts or calls with a Japan eSIM—but it depends on the type of eSIM plan you choose.

Data-only eSIMs: These plans provide internet access but do not support traditional voice calls or SMS. However, you can use internet-based apps like WhatsApp, LINE, or FaceTime for communication.
Voice+Data eSIMs: These plans include a real Japanese phone number, allowing you to make and receive calls and SMS messages. For instance, Mobal offers such plans with free incoming calls and texts, and a Japanese number starting with 070, 080, or 090

Japan eSIMs: Get a Japanese Phone Number or Data-Only Plan from Mobal

Can I receive texts or calls with Pocket WiFi?

= No, you cannot make or receive traditional phone calls or SMS text messages using a Pocket WiFi device alone. Pocket WiFi provides internet access, allowing you to use messaging and calling apps like WhatsApp, Skype, or iMessage over WiFi. However, it doesn’t support cellular services such as standard voice calls or SMS. To use your regular phone number for calls and texts, you’ll need an active mobile plan or a Voice+Data eSIM.