Best SIM in Japan for Foreigners 2026: No Credit Card Needed

This article contains affiliate links.

Last updated: 18 October 2026 (now matches the Japanese version; covers the 2026 identity-check changes; prices include tax)

Figures, prices and terms were checked against the official price pages of Rakuten Mobile and ahamo on 6 August 2026, and the identity-check rules against both companies’ official notices on 27 September 2026. They change – check the current terms yourself before you sign up or file anything.

With this in hand, you sign up today, without a credit card, on the plan that fits your usage – not the biggest one the shop pushes.

The first thing you need after arriving in Japan is a mobile plan. LINE, messages from your school or job, finding a part-time job, maps, translation – life stops when your phone does.

But foreigners hit walls that locals never see. This guide compares only the SIMs you can actually get – by price, data, coverage, eSIM, and one-year total cost – so you can pick the right one. Use the headings to jump to what you need.

The 30-second answer: which SIM fits you?

The three walls foreigners hit

You walk into a phone shop expecting to show some ID, pay cash, and leave with a working number. Where you come from, that may be all a SIM takes. In Japan, most budget SIMs accept credit cards only, and if little time is left on your residence card, the check can fail.

Getting a SIM in Japan has walls only foreigners hit. If you do not know them, a shop may turn you away or sell you an expensive plan.

Wall 1: No credit card

Most budget SIMs accept credit cards only. Right after you arrive, card applications often fail – and many people get stuck here. Rakuten Mobile accepts a debit card or bank transfer, so this wall disappears (ahamo also allows bank transfer). How to set up direct debit, and where debit cards get refused, is in how to pay in Japan without a credit card. Want a card too? See our guide on credit cards you can get as a foreigner.

Wall 2: Residence period check

You need a residence card to sign up, and if little time is left on it, the check can fail. Applying right after you renew your period of stay is the safe route.

Wall 3: Japanese-only sign-up

In-store explanations are mostly in Japanese, with a lot of jargon. Applying online lets you go at your own pace and use a translation app. Whether you can finish online depends on when your residence card was issued. The newer card issued from 14 June 2026 is not accepted by ahamo online. Rakuten Mobile has accepted it online since 1 September 2026. The details are in the identity-check section.

On language: Rakuten Mobile’s official site has a “Language” menu that switches it to English, Chinese (simplified and traditional), Korean, Vietnamese, Indonesian or Portuguese, and there is an online application guide in English. But the links from that guide into the actual application are marked “The link directs to Japanese”, so the final form is in Japanese. Keep a translation app open beside it.

If you would rather talk it through, go to a shop. Rakuten Mobile’s English page says shops give English support from application to initial setup. Rakuten Group’s own guide (Japanese) adds that whether a shop has staff who speak other languages varies by shop, so call ahead to check. Booking a visit also cuts the wait.

Comparing the four main options (2026)

The takeaway: Rakuten Mobile – no card needed, no cancellation fee – fits most newcomers best.

How much data do you actually need?

The most important thing in choosing a plan is how many GB you need. Too much is wasted money; too little and your speed is cut at the end of the month. Start with how much data each app uses.

These figures are the guides published by carriers and the Ministry of Internal Affairs and Communications. A LINE voice call uses about 18MB an hour (Japanese). A LINE video call uses about 307MB an hour. A map app uses about 1MB per 10 minutes (Japanese). YouTube uses about 0.48GB an hour at 480p and about 1.1GB at 720p (Japanese).

If you set up home internet separately, you’ll need far less phone data. See our home internet guide. Not sure? Rakuten’s “pay for what you use” plan matches the price to your use, so you can’t pick the wrong size.

#1: Rakuten Mobile – the walls disappear

• No credit card needed – debit card or bank transfer (the key point for foreigners)
• No wrong choice – price scales automatically with your usage in three steps
• Free calls – domestic calls from the Rakuten Link app cost ¥0
• Unlimited tethering – use your phone as home Wi-Fi
• No cancellation fee – leaving costs nothing when you change jobs or go home

Honest caveat: deep inside buildings or basements, the signal can still be weak. Fine for most city life, but if your school or workplace is underground or in a large building, consider ahamo (Docomo network) – see the coverage section.

#2: ahamo – for callers and coverage

• ¥2,970 for 30GB plus free 5-minute domestic calls – great if you make many job-application calls (from 1 December 2026: ¥3,135 a month up to 40GB)
• Docomo network: connects well underground and in buildings; the pick if signal stability matters most
• Bank transfer OK, no cancellation fee, and 30GB of free overseas roaming (handy for trips home)

Caveat: it’s fully online and in-store support costs extra. It’s flat ¥2,970 even in low-usage months, so it’s pricey for light users. The sign-up pages and support are in Japanese. We could not find an English version of ahamo’s official site (checked 18 October 2026), so plan to use a translation app.

What about povo and Nihon Tsushin?

povo has a ¥0 base and you buy data “toppings” only when needed – cheap if you master it, but not ideal as a first SIM (card required, and you get throttled if you forget to top up).

Nihon Tsushin SIM starts at ¥290/month for 1GB – the cheapest, if you have home Wi-Fi and use almost no data outside. Its 20GB “Minna no Plan” is ¥1,390 a month. Both plans add a one-off ¥3,300 sign-up fee. It takes a credit card or some debit cards (debit since July 2024). Bank transfer, convenience-store payment and paying by bank wire are not accepted. The sign-up info is mostly in Japanese.

You also need a My Number card. Since 25 March 2026 the only way to verify your identity is by reading the card’s electronic certificate in the Nihon Tsushin app; the website no longer takes applications (Nihon Tsushin notice on ending image-upload ID checks, in Japanese). A residence card alone is not enough, so get your My Number card and a phone that can read it first.

Where does coverage differ? A guide by city and building

Choose on price alone and you may have no signal when it matters. Each network is strong in different places.

If you live in a city and have no home Wi-Fi, Rakuten (unlimited data) fits. If your workplace or school is underground or in a large building, or you live in the countryside, ahamo on the Docomo network is the safer choice.

eSIM or physical SIM?

All four support eSIM. Choosing eSIM means you can activate on the day you apply at the earliest – no waiting for a card in the post.

If your phone supports eSIM (recent iPhones and major Android phones), eSIM is quicker and easier. With an older phone or one that does not support it, choose a physical SIM. A physical SIM comes by post; Rakuten Mobile delivers it in 2 days at the earliest. On the application form you just pick “eSIM” or “SIM card”.

How much in a year? SIM-only total cost

Adding up a full year, not just one month, makes the gap clear (SIM charges only, no phone).

The yearly figures are twelve months of the monthly price. Nihon Tsushin at 20GB (¥1,390 a month) comes to about ¥16,700, Rakuten used up to 20GB every month to about ¥26,100, and ahamo 30GB to about ¥35,600 (ahamo official: ¥2,970 a month x 12). ahamo goes to ¥3,135 a month up to 40GB from 1 December 2026, so after that it costs more than this. If you stay under 3GB every month, Rakuten is ¥1,078 x 12, about ¥12,900 (Rakuten Mobile official). Nihon Tsushin also charges the one-off ¥3,300 sign-up fee on top.

Rakuten Mobile charges by what you use, so light months cost less. If many of your months are light, the yearly gap grows further.

How to sign up and what you need

You need three things: your residence card, an address in Japan, and a payment method. Enter your name and address exactly as they appear on your residence card. If the romaji or katakana does not match, your application can be rejected. If you have not registered your address yet, do residence registration first.

What changed in 2026: how you prove who you are

Between March and April 2026 the identity check for mobile contracts changed. Uploading a photo of your document is finished. Your phone now reads the IC chip in your residence card and matches it to your face. Sign up without knowing this and you will stop halfway through.

There is a second problem, and it hits new arrivals hardest. From 14 June 2026 Japan began issuing a new residence card (the second-generation card, and the special card that doubles as a My Number card). ahamo does not accept that card online. ahamo points you to an electronics store or other shop instead. Rakuten Mobile has accepted it for its phone ID check since 1 September 2026.

Check the issue date on your own card first. It is printed on the front, at the bottom right. The same date matters again when you set up PayPay after your SIM: PayPay does not accept residence cards issued on or after 14 June 2026 for its identity check for now.

To read the IC chip your phone needs NFC. Most recent phones have it, but an older handset, or one you brought from home, may not. If your phone cannot read the chip, applying at a shop is the reliable route.

Rakuten Mobile’s phone ID check also fails if the IC chip does not hold your current address. Rakuten’s identity-document page gives the example of a card issued before your address was registered. In that case, apply at a Rakuten Mobile shop.

Rakuten Mobile also has a “check on delivery” option, where the courier looks at your ID at your door. The same page says it is not available to foreign nationals. If your phone cannot read the chip, apply at a shop.

The rules in this section were checked against the carriers’ own pages on 27 September 2026. Each company handles this differently and the rules keep moving. Official sources: Rakuten Mobile, notice on the change to identity checks for web applications / Rakuten Mobile, notice to foreign nationals on residence cards as ID / Rakuten Mobile, identity documents / ahamo, documents required for procedures

Three traps to avoid

1. Signing up on the spot at a carrier shop near the station

Shops may push large plans and extra options. Check the monthly price that fits your use in the table above before you go. A plan bigger than you need costs you the difference every month, for a whole year.

2. Taking a phone instalment loan with it

A 48-month device loan means the remaining balance comes due at once when you cancel or leave. You are freer if you buy a used or older model cheaply and get a SIM only.

3. Thinking free Wi-Fi is enough

Café and station Wi-Fi is unstable, and using banking or money-transfer apps on public Wi-Fi is risky. On Rakuten Mobile’s official fee page, a month with up to 3GB of data costs ¥1,078 (tax incl.), which is cheap insurance for when you have no Wi-Fi.

When you go home or switch

• Rakuten Mobile and ahamo both have no cancellation fee or penalty. You can cancel from the app or My Page.
• To move to another company and keep your number, use MNP (number portability). With the one-stop method (Japanese): if both your current and new company support the one-stop method, you just apply on the new company’s website. If you get a transfer number from your current company instead, doing it online is free (by phone or in a shop there may be a fee of up to ¥1,100).
• Once your return date is set, check the cancellation date and the date of the last payment before you close your bank account. Close the account first and the bill stays unpaid.

Official sources: Rakuten Mobile official pricing / Ministry of Internal Affairs and Communications, identity check rules for mobile contracts (Japanese) / Immigration Services Agency, the special residence card (Japanese) / Rakuten Mobile, notice on the change to identity checks for web applications / Rakuten Mobile, notice to foreign nationals on residence cards as ID (Japanese) / Rakuten Mobile, identity documents (Japanese) / ahamo, documents required for procedures (Japanese) / Docomo, ahamo price change from December 2026 (Japanese) / Rakuten Mobile, delivery (Japanese) / Nihon Tsushin, Minna no Plan (Japanese) / Nihon Tsushin, Simple 290 plan (Japanese) / Nihon Tsushin, accepted cards (Japanese) / Nihon Tsushin FAQ (Japanese) / Nihon Tsushin, end of image-upload ID checks (Japanese) / Ministry of Internal Affairs and Communications mobile portal, switching without changing your number (Japanese) / LINEMO, data used by LINE calls (Japanese) / Ministry of Internal Affairs and Communications mobile portal, reviewing your plan (Japanese) / ahamo, YouTube data use (Japanese) (checked 26 September 2026; ID rules, Nihon Tsushin prices and payment, and data-use guides checked 27 September 2026; Rakuten Mobile language support and Saikyo Plan prices checked 2 October 2026; MNP fees, ahamo language and December prices, and SIM delivery time checked 18 October 2026)

Frequently asked questions

Can I sign up without a credit card?

Yes. Rakuten Mobile accepts a debit card or bank transfer. ahamo allows bank transfer. Nihon Tsushin takes a credit card or some debit cards, but not bank transfer. povo usually needs a credit card.

Can I apply with just my residence card?

Yes, the residence card is accepted as your ID. Enter your name and address exactly as written on it. One exception: the newer card issued on or after 14 June 2026 (second-generation or the special My Number version) is not accepted online by ahamo. With that card, apply for ahamo at a shop. Rakuten Mobile has accepted it online since 1 September 2026.

My phone will not read the IC chip on my residence card.

Your phone may not have NFC, or it may be switched off. Check the settings first. If it still will not read, apply at a shop. Rakuten Mobile’s “check on delivery” option is not available to foreign nationals. Uploading a photo of the card stopped working in March 2026, so a photo is not a substitute.

Can I activate the same day with eSIM?

Yes, on an eSIM-capable phone, right after ID verification. A physical SIM comes by post; Rakuten Mobile delivers it in 2 days at the earliest.

Can I sign up in English?

With Rakuten Mobile, the official site and its application guide can be read in English and six other languages. The final application form is in Japanese, so use a translation app. If you want to talk it through, shops say they support you in English from application to setup, but staff who speak other languages vary by shop, so call ahead to check.

Can I sign up if little time is left on my period of stay?

Yes, but if very little time is left, the check can fail. Applying right after you renew your period of stay is the safe route.

Can I switch and keep my current phone number?

Yes. With MNP (number portability) you keep your number when you switch. If both your current and new company support the one-stop method, you just apply on the new company’s website. If you get a transfer number from your current company instead, doing it online is free. By phone or in a shop there may be a fee of up to ¥1,100.

Is there a cancellation fee when I leave Japan?

Rakuten Mobile and ahamo both have zero cancellation fees. Confirm the date of the last payment before closing your bank account.

How much data do I need?

About 2-3GB if you mostly use LINE calls and social media and have Wi-Fi at home; 10-20GB if you watch video while out; 50GB or more if you have no home Wi-Fi and tether instead. If unsure, Rakuten Mobile’s “pay for what you use” plan is the safe choice. Even if you use a lot, it tops out at ¥3,278 for unlimited data, and in a light month it drops to ¥1,078 automatically.

Can I use my phone as home Wi-Fi?

Rakuten Mobile has unlimited, free tethering, so some people use it instead of home internet. See our home internet guide.

Summary: two easy choices

• No card / don’t want to overpay → Rakuten Mobile (from ¥1,078, pay for what you use)
• Many calls / want a strong signal underground or in the countryside → ahamo (30GB + free 5-minute calls, ¥2,970; from 1 Dec: ¥3,135 up to 40GB)

Both have zero cancellation fees, so you can start with one and switch if it doesn’t fit. The most expensive mistake is paying for an over-sized plan a shop sold you. If a shop did talk you into one, phone contracts come with an 8-day cancellation window, narrower at Docomo, au and SoftBank.

Related guides

• If you want internet at home this week without an installation visit → Home internet in Japan
• If you do not want to fail a credit card check → Credit cards foreigners can get
• If you want to check what to do within 14 days of arriving → Residence registration (juminhyo)

You may use the figures in this article, including commercially, if you credit this site with a link. How to use our figures