2026 Guide

Unlocked Phones in Japan: Where to Buy and What to Check

Why this matters more than you'd think.

A locked phone is the silent reason a lot of foreigners end up overpaying for mobile service in Japan. If your phone is tied to a specific Japanese carrier, you can't take advantage of the cheaper online brands without buying a new device or going through an unlocking process. Walking into your mobile decision with an already-unlocked phone — bought from home, bought new in Japan since 2021, or carefully chosen used — gives you the full range of cheap plans we cover elsewhere on this site.

It also matters when you leave Japan. An unlocked phone is far easier to sell, easier to repurpose with a SIM in your next country, and worth more on the resale market. A phone locked to a now-cancelled Japanese carrier is, for most buyers in your home country, useless.

The good news is that since the Japanese government's 2021 regulations, almost all new phones sold in Japan are unlocked by default. The complications only show up with used purchases, carrier-bundled deals, and phones brought in from overseas.

Section 02

Where to buy new unlocked phones.

The order below is roughly best-to-worst for a foreign resident who wants minimum friction.

Apple Store (for iPhones)

Apple sells iPhones directly through its Japan website and physical stores in major cities. Every iPhone sold this way is unlocked, supports every Japanese LTE and 5G band, and comes with full English-speaking sales and support if you ask. Prices include consumption tax. You can pay with foreign credit cards or PayPay. Refurbished iPhones from Apple's own program are also unlocked and come with the same one-year warranty as new.

Yodobashi Camera, Bic Camera, Yamada Denki

These three giant electronics retailers have a "SIM-free" (SIMフリー) section that sells unlocked Androids from Google (Pixel), Samsung, Sony, Sharp, ASUS, OPPO, and others. Bring your residence card; you'll need it for the purchase even when paying by foreign card. Prices are competitive with manufacturer direct, and you often get points back that can be used in the same store for accessories. Staff don't always speak English fluently, but the SIM-free section is clearly labeled and the boxes are clearly marked.

Manufacturer online stores

Google Store, Samsung Japan, Sony Mobile, Xiaomi Japan, and others sell their phones directly online, often with payment plans available without a carrier. This is the cleanest way to get the exact model you want with no carrier bloatware or branding. Delivery is fast within Japan.

Rakuten Mobile and other carrier "SIM-free" deals

Some carriers, especially Rakuten Mobile, sell phones as SIM-free even if you sign up for their plan at the same time. The phone itself is unlocked and you can swap to another carrier's SIM later. But be careful: device installment plans may carry implicit lock-in (you have to keep using the carrier's plan to qualify for the discount), and migration penalties can apply. Read the fine print.

Department stores' online tax-free section

Some department stores like Takashimaya and Isetan have online sections selling phones to overseas residents or visitors. These are usually export-spec models — they work in Japan but may be priced for non-resident tourists. Not the right path for a resident.

Section 03

Buying used: the real options.

Used phones can save 30–60% off new prices, but require more care. Here's the realistic landscape.

Iosys, Janpara, Sofmap (refurbisher chains)

Specialty shops with both online stores and physical locations (Akihabara is the obvious hub). They test phones, grade them by condition, confirm unlocked status, and offer short warranties — typically 30 days to 3 months. Prices are higher than Mercari but the buying experience is closer to retail, and the risk of getting a problematic phone is lower. English support varies; written information is usually clear enough.

Mercari (メルカリ)

Japan's dominant peer-to-peer marketplace. Massive selection, lower prices, but no warranty and quality varies by seller. Filter for SIMフリー (SIM-free) listings, check seller ratings, and ask sellers explicit questions about the phone's lock status and whether the original carrier ever flagged it. Pay attention to "残債" (zansai, remaining device debt) — phones where the original buyer is still paying installments can be remotely locked by the carrier later.

Rakuma (楽天ラクマ)

Similar to Mercari, smaller but cheaper fees for sellers, so often slightly better prices. Same warnings apply: confirm SIM-free status, confirm no remaining installments, confirm IMEI is clean.

Yahoo! Auctions / PayPay Flea Market

Older but still active. Better for niche models or sellers willing to negotiate. Same due-diligence checklist.

Section 04

What to check before buying a used phone.

The five-minute checklist that separates a good deal from a bad one:

SIM-free / unlocked statusThe listing should explicitly say SIMフリー (SIM-free), 制限なし (no restrictions), or 〇 (clean) under "ネットワーク利用制限" (network use restriction). Avoid listings marked ▲ (warning, installment unpaid) or × (blocked, often called "red ROM" / アカロム).
IMEI is cleanEach carrier publishes a tool to check IMEI status — you enter the IMEI number from the phone, and it tells you whether the device has been flagged. A good seller will provide the IMEI on request, or list it in the description.
Battery healthFor iPhones, ask the seller for a screenshot of Settings → Battery → Battery Health, which shows the maximum capacity percentage. Anything under 85% is showing real wear. For Androids, there's no universal screen but apps like AccuBattery can give a reading.
Physical condition matches photosInsist on photos of all sides, corners, the screen on and off, and the camera lens. Dents and chips can hide damaged internals.
Original box and accessoriesNot essential, but presence of the original box, charger, and unused accessories often correlates with a phone that was treated well. Also helps resale later.
Activation lock statusFor iPhones, the previous owner must remove their iCloud activation before selling. If the phone arrives still tied to their Apple ID, you can't use it. Confirm before paying — ask the seller to show the phone in the "Hello" setup screen.

Section 05

Bringing a phone from your home country.

Almost certainly the simplest path if you're moving to Japan with a phone you already own and like. Here's the checklist:

Confirm your phone is unlocked
If you bought the phone on a contract through a carrier in your home country, contact that carrier to confirm it's been unlocked. Most major US, UK, and EU carriers will unlock free if your contract is paid off. Apple-purchased iPhones bought outright are already unlocked.
Check Japan band support
For LTE: bands 1, 3, 19, 28. For 5G sub-6: bands n77, n78. iPhones from iPhone 8 onward, recent Pixels, recent Samsung Galaxy phones, and most flagship Sony, Xiaomi, and OnePlus models all support these. Older or budget phones, especially region-specific models, may not.
Cross-reference your specific model
WillMyPhoneWork.net and the manufacturer's spec sheet are reliable for this. Search for your exact model number and look for the relevant LTE/5G bands. Don't trust general claims like "global model."
Get an eSIM for the first weeks
Even before you set up a domestic carrier, you can put a travel eSIM on the phone the day you land. See our best eSIM for Japan guide.
Switch to a domestic plan once your residence card is ready
With a residence card and a Japanese payment method, you can move to LINEMO, povo, ahamo, or Rakuten Mobile. See our main SIM guide for the full carrier comparison.

Section 06

Carrier-locked phone: how to unlock it.

If you discover a phone you already own is carrier-locked — either because you bought it on a contract overseas or because you bought it through a Japanese carrier years ago before the 2021 rules — the unlock process is usually free and fast.

Japanese carriers

By law, the three major Japanese carriers must unlock phones for free under reasonable conditions. Log in to docomo, au, or SoftBank's website (My docomo, My au, My SoftBank), find the SIM lock removal option (SIMロック解除), and submit your IMEI. Most phones are unlocked instantly. Some older models require a visit to a physical store.

US carriers

T-Mobile, AT&T, and Verizon all unlock postpaid phones for free once the device is fully paid off and the line has been active for a minimum period. Submit a request through their support pages. Processing usually takes 1–3 days.

UK and EU carriers

EE, O2, Vodafone, Three (UK), Orange, Vodafone (Germany), and similar provide free unlocking on request after the device is paid off. Some still charge a token fee for older devices.

Australian carriers

Telstra, Optus, Vodafone all unlock devices free of charge — usually instant for newer phones, a day or two for older ones.

Section 07

When to skip the phone purchase entirely.

If you're staying in Japan for a few months and your current phone works fine, don't feel obligated to buy a Japanese phone. Just put a Japanese SIM in the phone you already own. The savings from buying nothing usually outweigh whatever marginal advantage a Japan-market phone offers.

The cases where a new phone in Japan does make sense:

Your current phone doesn't support Japan's LTE bands (rare for any modern smartphone)
You want a model that's hard to get in your home country — certain Sony Xperia, Sharp Aquos, or specific colors
You're staying long-term and want the convenience of in-Japan warranty service
Your phone is genuinely failing and needs replacement anyway

For most foreign residents, especially in their first year, sticking with the phone you brought and just upgrading the SIM is the cheaper and simpler path. Once you have an unlocked phone working with a cheap Japanese SIM, the rest of the system clicks into place — and our cheapest mobile plans guide covers where to go from there.

If you're just arrived and trying to figure out the whole picture — phone, SIM, residence card, payment — our main SIM guide for foreigners is the place to start, and the APN settings guide handles the technical setup once the SIM is in.

FAQ

Frequently asked questions

What does 'unlocked' mean in the Japanese context?

An unlocked (SIM-free) phone in Japan works with any carrier's SIM — docomo, au, SoftBank, Rakuten, LINEMO, povo, and so on. By contrast, a carrier-locked phone is restricted to the carrier you bought it from. Since 2021, Japanese law requires carriers to sell phones unlocked by default for new contracts, so most phones bought new in Japan today are already unlocked.

Where can I buy an unlocked iPhone in Japan?

Apple Store (online or physical) sells unlocked iPhones directly — this is the simplest and most reliable path. Major electronics retailers like Yodobashi Camera, Bic Camera, and Yamada Denki also sell SIM-free phones. Used and refurbished unlocked phones are available through Mercari, Rakuma, online refurbishers like Iosys, and specialty shops in Akihabara.

Is it cheaper to buy a phone in Japan or in my home country?

It depends on the model and the moment. iPhones are typically priced similarly to the US once tax is factored in, sometimes slightly cheaper in Japan. Flagship Samsung and Google Pixel phones can be cheaper or more expensive depending on import duties in your home country. Used Japanese-market phones are often a great deal but need a careful network-band check first.

Will an iPhone from my home country work in Japan?

Almost certainly, yes — iPhones sold by Apple (whether in the US, EU, UK, Australia, or directly from the Apple Store in Japan) support all the major Japanese LTE and 5G bands. The only caveat is that the phone needs to be carrier-unlocked. Phones bought on a carrier contract overseas may need unlocking through that carrier before they'll accept a Japanese SIM.

What about phones sold only in Japan — will they work overseas?

Sometimes yes, sometimes no. iPhones sold in Japan are technically the same hardware as elsewhere and work globally. Some Japan-market Android phones (especially older docomo, au, and SoftBank exclusives) have unusual band configurations and may have limited connectivity overseas. Check the model's spec sheet on the manufacturer's global site before assuming.

Can I use a used phone bought on Mercari with a Japanese SIM?

Usually yes, but with caveats. Confirm the phone is unlocked (SIM-free or SIMフリー in the listing), check that it hasn't been reported lost or stolen (some carrier-locked phones become unusable if reported as such — this is called 'red ROM' in Japanese slang, akarom), and verify it supports the bands your chosen carrier uses. A 15-minute check before buying saves a lot of headaches.