- September 18, 2026
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If you’re a foreign resident in Japan, you may still be on the plan you signed up for right after arriving—paying somewhere around ¥8,000 a month. Switching to a cheap SIM in Japan could change that. Plenty of people know cheaper plans exist but keep putting off the switch, unsure about the ID checks or dealing with it all in Japanese.
Here’s the good news: move to a plan that fits how you actually use your phone, and getting your bill down to around ¥3,000 a month is well within reach. With MNP, you can often keep your current number, too.
In this guide, certified financial planner Masamichi Takayanagi walks you through Japan’s mobile carriers—the ID checks and payment methods foreign residents run into, which providers suit you right after you arrive versus once you’ve settled in, and how to switch using MNP.
A good first step: open your current carrier’s app or account page and check how much data you’ve used over the past three months.
About the Supervisor & Writer
Masamichi Takayanagi
Financial Planner & columnist;
An independent financial planner with extensive experience as a financial columnist, specializing in a wide range of topics including asset management, life insurance, inheritance, loan products, and credit cards. Over 1,000 articles and projects have been contributed to the field.
1st grade Certified Skilled Professional of Financial Planning, Certified Financial Planner®.
Table of Contents
Chapter 1: The Map of Japan's Mobile Providers
Japan’s mobile services are easier to understand if you split them into five groups:
- The four major carriers: docomo, au, SoftBank, and Rakuten Mobile
- Online-only plans and brands: ahamo, povo, and LINEMO
- Sub-brands with store access: UQ mobile and Y!mobile
- MVNOs (budget SIMs): IIJmio, mineo, and others
- Services aimed at foreigners: Mobal, Sakura Mobile, and GTN Mobile
The trick is to choose on more than price alone—weigh in-store support, ID checks, and payment methods too.
The Four Major Carriers: For Those Who Value Support
Japan’s major carriers are docomo, au, SoftBank, and Rakuten Mobile.
docomo, au, and SoftBank have stores nationwide, which makes it easy to get help with billing questions or device setup face to face. The trade-off: use a high-data plan without discounts, and the monthly cost climbs quickly.
Take docomo MAX—once your data use tops 3GB, the standard rate is ¥8,448 a month. It gets cheaper if you meet conditions like a family discount, a home internet line, or a certain payment method, but the key is not to judge by the discounted rate in the ads alone.
Rakuten Mobile also runs its own network, so it’s an MNO, not an MVNO. Its pricing is close to a budget SIM, but structurally it’s classed with the major carriers.
Online-Only Plans: ahamo, povo, and LINEMO
If you don’t need much in-store support and care about balancing price with a solid connection, online-only services are worth a look.
ahamo is docomo’s online plan: 30GB for ¥2,970 a month. Domestic calls under five minutes are free, and you can use data at no extra charge in 91 eligible countries and regions abroad, under certain conditions.
povo2.0 has a base fee of ¥0—you buy data and other “toppings” as you need them. A typical topping is 30GB for 30 days at ¥2,780. Note that if you don’t buy a paid topping within a certain period, your line can be suspended or canceled, so check the conditions even if you’re using it as a backup line.
LINEMO’s Best Plan is ¥990 up to 3GB and ¥2,090 up to 10GB. The Best Plan V bundles 30GB with unlimited domestic calls under five minutes for ¥2,970 a month.
With all of these, you sign up and make changes online. Alongside the price, it’s worth asking whether you can handle the ID verification and setup yourself, in Japanese.
Budget Options with Stores: UQ mobile and Y!mobile
If going fully online feels daunting, UQ mobile and Y!mobile—both with physical stores—are worth considering.
UQ mobile’s Komikomi Plan Value bundles 35GB with domestic calls under 10 minutes for ¥3,828 a month. New subscribers to an eligible plan can get a ¥660 discount for a set period, bringing it to ¥3,168 a month for up to 13 months in some cases.
That said, the discount comes with conditions on who qualifies and for how long. When you’re comparing costs over the long term, check the monthly rate after the discount ends too.
Y!mobile’s Simple 3 comes in three sizes: S at 5GB for ¥3,278, M at 30GB for ¥4,378, and L at 35GB for ¥5,478 a month. The L plan also includes unlimited domestic calls under 10 minutes.
Because family discounts and home internet bundles can change your actual cost significantly, it’s reassuring to compare both “just me switching” and “the whole family” scenarios.
MVNOs (Budget SIMs): IIJmio and mineo
If your monthly data use isn’t that heavy and you want to keep fixed costs as low as possible, an MVNO is a good fit.
IIJmio typically runs ¥950 a month for a 5GB voice SIM and ¥1,600 for 15GB. You can choose in fine steps from small to mid-range data, which suits anyone who’s on Wi-Fi a lot of the time.
mineo lets you pick from three networks—docomo, au, and SoftBank. Its My Pita plans offer several sizes from 3GB to 50GB, ranging from ¥1,298 to ¥2,948 a month.
MVNOs run on the network of whichever major carrier they use. But because they provide service by renting that network, speeds during busy times—like the lunch hour—can differ from the carrier itself.
Don’t assume “same network, so exactly the same speed.” Factor in the times of day you use your phone most when you choose.
Services for Foreigners: Mobal, Sakura Mobile, and GTN Mobile
If you’ve just arrived and don’t yet have Japanese payment methods set up, services designed for foreign residents are another option.
Mobal offers a Voice-Only eSIM with a Japanese phone number from ¥1,430 a month. Plans with both voice and data are priced separately, and one of its draws is English-language support.
Sakura Mobile provides voice SIMs aimed at longer-term use, with a 5GB plan from ¥3,278 a month. It offers English support and accepts overseas-issued credit cards—handy for anyone who’s just arrived.
GTN Mobile also focuses on support for foreign residents. Its Eazy plan starts at ¥1,200 a month for 3GB, and in some cases you can use several payment methods, including convenience store payment.
Being “for foreigners” doesn’t guarantee you can sign up, though. The required documents, residency conditions, and payment methods differ by provider, so check before you apply.
Chapter 3: Choosing a Cheap SIM in Japan: What to Check Before You Switch
Know Your Own Usage First
Before switching, check your data use over the past three months in your carrier’s app or account page.
Using 5GB or less? IIJmio or LINEMO fit. Around 20–30GB? Look at ahamo, LINEMO’s Best Plan V, or povo. If your usage swings, Rakuten Mobile adjusts—¥1,078 up to 3GB, ¥2,178 up to 20GB, ¥3,278 over 20GB.
Check your calls too—lots of short ones, or long ones?—since that decides which options you need. And if you’re on a family discount or home-internet bundle, one person switching can raise the rest of the family’s bill. Compare the household total, not just your own.
Where Foreigners Get Stuck
Switching carriers often stalls at ID verification or payment.
Make sure the name, date of birth, and address on your application match your ID document, such as your residence card. If your address isn’t updated yet, sort that out first.
LINEMO, for example, accepts the residence card as ID—and for the new format issued from June 14, 2026, some verification methods may require confirmation at delivery.
Payment is usually by credit card or direct debit. Some providers take overseas-issued cards, but it varies by card. Screening criteria aren’t published, so rather than guessing your odds, just check that you meet each provider’s stated ID and payment requirements.
Switching by Stage: Right After Arrival vs. Once You’re Settled
You don’t have to chase the cheapest rate the moment you arrive.
At first, pick a service that works with the documents and payment methods you have now, and secure a Japanese number. Once life settles down, compare rates and data and move to a better-fitting plan. There’s no rule that locks you into any one provider—foreigner-focused or otherwise.
It’s worth looking at switching once conditions like these are in place:
- Your ID document’s address matches where you live now
- You have a payment method your target carrier accepts
- You know your data use over the past few months
- You’ve checked your current contract’s cancellation and MNP terms
You don’t need both a bank account and a credit card—accepted methods vary by provider, so just check they take one you can provide.
Chapter4 : Keeping Your Number (MNP)
If you want to keep your current phone number, you use MNP. Between providers that support MNP One-Stop, you can start the process from your new provider without getting a reservation number.
If either your old or new provider doesn’t support it, you’ll need an MNP reservation number the traditional way.
Foreigner-focused services vary by plan. With Mobal, some Voice+Data 5G eSIM plans allow MNP transfer-in, while others—like Voice Lite—don’t. With GTN Mobile, the Eazy plan supports MNP both in and out. If you want to keep your number for the long term, check before signing whether MNP transfer-out is possible.
Switching goes in five stages:
- Check your recent data and call use, and narrow it down to about two candidates.
- On the official sites, check the price, accepted ID documents, payment methods, and cancellation terms.
- If you’re using MNP, check One-Stop support or whether you need a reservation number.
- Activate your SIM or eSIM, and set up the connection (APN and so on) if needed.
- Confirm that calls, SMS, and mobile data all work.
A physical SIM means waiting for it to arrive by post. An eSIM, on a compatible device, can sometimes be activated without waiting for a card.
But an eSIM doesn’t always activate the same day. ID checks, screening, and reception hours can push it to the next day or later—so don’t cancel your current line first. eSIM setup also varies by provider and device: some use a QR code or activation details, and on Android you may need to set the APN manually. Follow the steps you’re given as you go.
Chapter6 : How Much You'll Save
If your current phone bill is, say, ¥8,000 a month, changing plans could save you tens of thousands of yen a year.
Some examples:
- From ¥8,000 to ahamo’s ¥2,970: ¥5,030 less a month—¥60,360 a year
- From ¥8,000 to LINEMO’s 3GB plan at ¥990: ¥7,010 less a month—¥84,120 a year
- From ¥8,000 to Rakuten Mobile’s ¥3,278: ¥4,722 less a month—¥56,664 a year
These aren’t like-for-like on data, though. LINEMO’s ¥990, for instance, is for up to 3GB—someone using 30GB a month can’t simply drop to ¥990, so compare plans that match your own usage.
Also, if your current ¥8,000 includes device installments, changing carriers can leave the device payments running. The key is to compare your data charge, call options, and device cost separately—not just your total bill to the carrier.
Chapter7 : Things to Watch Before Choosing a Cheap SIM in Japan
Phone plans and campaigns change often. ahamo went from 20GB to 30GB in October 2024, and povo ended its old 20GB/30-day plan at ¥2,700, now offering 30GB/30 days at ¥2,780 instead. Y!mobile also revised its rates in 2026. Don’t rely on an old comparison article—check the official site right before you apply.
Also, the lowest advertised rates often assume a family discount, an internet bundle, or card payment. Check the standard rate first, then subtract only the discounts you can actually use—it makes comparison much clearer.
And even with no fixed contract term, some services charge a cancellation fee if you leave within a year. Before you commit to a cheap SIM in Japan, check the cancellation terms, not just the price.
Chapter8: Frequently Asked Questions About Getting a Cheap SIM in Japan
Q. Can foreign residents sign up for a budget SIM?
Yes, as long as you meet each provider’s conditions for ID and payment. The required documents differ by provider, though. Before applying, check that the name and address on your application match your residence card.
Mobal, Sakura Mobile, and GTN Mobile offer support for foreign residents—but “for foreigners” doesn’t mean “no screening.” Check the ID documents and payment methods you can provide now, and start by comparing the providers whose conditions you meet.
Q. Do I need a Japanese credit card?
Not necessarily. Some providers let you pay by direct debit from a Japanese bank account, and others accept overseas-issued credit cards.
Sakura Mobile takes overseas-issued cards, and Mobal supports several cards and online payment methods. With GTN Mobile, convenience store payment may be available depending on the plan and contract. There’s no need to assume you can’t get a phone until you’ve made a Japanese credit card. Check the official site for whether the card or bank account you already have will work.
Q. Can I keep my number?
If your plan supports MNP, you can switch to another provider and keep the same number. Between providers that support MNP One-Stop, you can even do it online without getting a reservation number in advance.
That said, foreigner-focused services vary by product. With Mobal, some longer-term Voice+Data 5G eSIM plans allow MNP transfer-in, while other products don’t. With GTN Mobile, the Eazy plan supports both transfer-in and transfer-out. If you want to keep your number long-term, check that “MNP transfer-out” is clearly stated before you sign.
Chapter9: Summary
You can often cut your phone bill in Japan to around ¥3,000 a month by moving to a cheap SIM in Japan that fits how you actually use it.
Beyond the four major carriers, there’s plenty of choice—ahamo, povo, LINEMO, UQ mobile, Y!mobile, IIJmio, mineo, and more. For foreign residents, there’s also Mobal, Sakura Mobile, and GTN Mobile.
Before switching, check the ID documents, payment methods, and MNP support. You don’t necessarily need both a Japanese bank account and a credit card.
Know your current data use, and compare the standard rate, data allowance, call charges, and cancellation terms—that’s how you land on the plan that fits you.
*This article is provided for general informational purposes only and does not constitute individual financial advice. The prices and plans shown here are based on the sources cited and change frequently. Information is accurate as of September 2026, but mobile plans, fees, and campaigns are revised often, so always confirm the latest details on each provider’s official website before signing up. Eligibility for a given plan, required documents, payment methods, and MNP support differ by provider and by your own circumstances, so check that you meet each provider’s stated conditions before acting on any information in this article.
