eSIM Japan on a locked phone: what to do in 2026
TL;DR: A carrier-locked phone will refuse any third-party eSIM, including PlanJapan. Locking is still common in the US (Verizon, AT&T, T-Mobile Prepaid), the UK (O2 Pay-as-you-go, EE prepay), Canada and Australia, but virtually absent in France and the EU since 2018. Check your status in 30 seconds via Settings > General > About > Carrier Lock (iPhone) or *#06# + a call to your carrier (Android). A locked device cannot activate an NTT Docomo / SoftBank / KDDI travel eSIM in Japan. Solutions: free unlock from your original carrier, borrowing a phone, or pocket WiFi rental on arrival.
Locked phone: what it really means for your Japan eSIM
Carrier lock — also called "SIM lock" in Apple and Android documentation — is a software restriction imposed by the carrier that sold you the phone on credit or with a subsidized plan. Concretely, the phone refuses any SIM or eSIM that does not come from that carrier (or its partner MVNOs). When you try to install a PlanJapan eSIM by QR code, the phone displays either "Invalid SIM", "Activation failed — carrier not authorized", or, more sneakily on some Galaxy S models, accepts the profile but refuses to activate data once you land in Japan.
Locking has become rare in France since the law of 17 March 2014 (article L. 224-71 of the Consumer Code), which forces Orange, SFR, Bouygues and Free to unlock for free after 3 months, then immediately and free of charge after 1 January 2018 on simple request. iPhones sold directly by Apple Store, Fnac, Boulanger or Amazon in France are never locked. Same picture in Germany, Spain, Italy, the Netherlands and most of the EU since 2020. The situation differs sharply in the United States (Verizon imposes a 60-day lock, AT&T 60 days on iPhones, T-Mobile Prepaid 12 months), the UK (EE Pay-as-you-go locked 6 months, O2 prepay locked until manual unlock), Canada, Australia and Japan (an iPhone bought from Docomo, SoftBank or au stays locked until you have fully paid for the device).
This distinction is critical: if you are travelling to Japan with an iPhone bought in France after 2018, the lock worry is almost zero. If you travel with a US iPhone, a Pixel bought from Verizon or a Samsung bought in London on prepay, you must check before departure. Our companion guide on using a Japan eSIM without unlocking your phone details the rare scenarios where you can still get around the problem.
How to check in 30 seconds whether your phone is locked
Before you pay for an eSIM or consider changing phones, check your status precisely. The method depends on your OS and changes with each version. On iPhone (iOS 14 and later), go to Settings > General > About, then scroll down to "Carrier Lock". Two possible values: "No SIM restrictions" (you are free, PlanJapan will work) or "SIM locked" (carrier locked — action required). Write down the exact wording shown: it is the official proof you will present to your carrier in case of doubt.
On Android (Samsung Galaxy, Google Pixel, Xiaomi, OPPO, OnePlus), there is no unified equivalent menu. Three complementary methods. Method 1: dial *#7465625# on Galaxy or *#06# then ask your carrier the status of the displayed IMEI. Method 2: physically try inserting a SIM card from another carrier (a friend with a Mint Mobile or Visible card, for example). If the phone displays "no service" or "SIM not authorized", it is locked. Method 3, the most reliable for US or UK models: call the original carrier (Verizon, EE, T-Mobile) and provide your IMEI — they will confirm the status in less than 2 minutes.
Special case of a used iPhone bought on eBay, Swappa, Facebook Marketplace or directly from an individual: the seller may ignore or hide that the phone is still tied to an iCloud account (activation lock, different from SIM lock) or to a US carrier. Before purchase, systematically ask for a screenshot of Settings > General > About showing "No SIM restrictions". For used Galaxy phones, ask for the original invoice or perform a physical test with a third-party SIM. This 30-second check avoids hundreds of dollars of wasted eSIM and an arrival at Narita with no connection — the worst possible scenario. Our article Japan eSIM: what to do if your phone is not compatible covers the other traps beyond locking (hardware compatibility, 4G/5G bands).
US iPhone: Verizon, AT&T, T-Mobile and the 60-day rule
If you bought your iPhone from Verizon, AT&T, T-Mobile or a US MVNO (Mint Mobile, Cricket, Visible, Boost Mobile, Metro by T-Mobile), it is very likely locked out of the box. The 2026 policy: Verizon Postpaid automatically unlocks after 60 days of active phone usage — no action required, but 60 days firm. AT&T Postpaid unlocks after 60 days and full payment of the device (no active financing). T-Mobile Postpaid: 40 days plus full payment. T-Mobile Prepaid: 365 days of active use. Verizon Prepaid: 60 days of continuous use, then automatic unlock within 24 hours.
For an American traveller flying to Japan, the good news is that Apple Store US sells unlocked iPhones (A2xxx models, no carrier lock) if you pay cash or one-time. If you chose monthly Apple Card financing, the iPhone ships unlocked but stays tied to your Apple Card account. If you travel with an iPhone provided by your US employer (Verizon or AT&T corporate), you must request a formal unlock from your company's IT department before departure: the process goes through an internal ticket and can take 5 to 10 business days.
Verizon unlock procedure in practice: open the My Verizon app, go to Devices > Manage Devices > Unlock Device, check eligibility, submit the request. Turnaround: under 24h for an eligible phone. AT&T: portal unlockit.att.com, enter IMEI, check eligibility, request under 48h. T-Mobile: T-Mobile app > Account > install the T-Mobile Unlock app (Android) or request through support for iPhone, validation within 72h. Once the SMS confirmation arrives, restart the iPhone, remove and reinsert the original physical SIM, then activate your PlanJapan eSIM as on any compatible iPhone. If the confirmation is delayed, contact Verizon Wireless Customer Service at +1-800-922-0204 from abroad (also reachable via WhatsApp and iMessage).
Locked Android: Samsung, Pixel, Xiaomi — specific traps
On Android, locking is more opaque than on iPhone because each manufacturer and each carrier applies its own logic. On Samsung Galaxy (S22, S23, S24, S25, Z Fold, Z Flip) bought from Verizon or T-Mobile US, locking is managed by a preinstalled "Device Unlock" app that must receive a push authorization from the carrier after eligibility. Without that authorization, it is impossible to install a third-party eSIM — the phone silently rejects the profile in Settings > Connections > SIM Manager. On Google Pixel bought from Verizon (Pixel 7, 8, 9, 10), the lock follows the same 60-day rule but the unlock is fully OTA (over-the-air): Verizon pushes the unlock profile and the Pixel unlocks automatically, without user intervention.
Special case of Xiaomi and OPPO phones imported directly from China via AliExpress or Banggood: these "China Mainland" models can be locked to specific Chinese 4G bands and fail to receive bands 1, 3, 19, 28 used by NTT Docomo and SoftBank in Japan. This is not strictly a carrier lock but produces the same result — no eSIM connection. Always check the "Global Version" or "EU Version" labelling and the supported 4G LTE bands before purchase. Our Japan eSIM Android Samsung guide details the configuration once the phone is unlocked, including the specific APN settings for Docomo and SoftBank.
For Japanese Galaxy models (SC-xx sold by Docomo, SCG-xx by au, SCV-xx by SoftBank), it should be noted that they are locked and the unlock procedure requires Japanese resident status: an active My Docomo account for 6 months or full payment of the phone, plus a physical store visit with a residence card (Zairyu Card). For a tourist, that is inaccessible — either buy a "SIM Free" Galaxy directly at Yodobashi Camera or BIC Camera (SC-xx-SF model), or bring a European Galaxy Global Version. The price of a SIM Free Japanese Galaxy stays 15-20% higher than in Europe, which makes it rarely worth it for a short trip.
Unlocking your phone before departure: process, lead times, costs
If your check has confirmed a lock, start the procedure 10 to 14 days before departure to absorb administrative lead times and weekends. For France it is free and fast: Orange (customer portal > My options > Unlock my mobile, code received within 72h), Free Mobile (subscriber portal > unlock request, instant for recent iPhones), SFR (3970 or portal, under 48h), Bouygues Telecom (614 or app, under 48h). No fees, no questions asked — it is a consumer right. Keep the unlock code by email: it also helps if you change French SIM in the future.
For US carriers, count 24 to 72 hours for Verizon and AT&T standard requests, up to 5 business days in high season (summer, Black Friday, Christmas). T-Mobile Prepaid can require 7 to 14 days depending on account age. For UK carriers: EE (My EE app > Account > Unlock your device, free, 10 business days), O2 (online form, free, 10 days), Vodafone UK (online form or 191, free, 7 days), Three (My3 app, free, 7 days). In Canada (Rogers, Telus, Bell), unlocking has been mandatorily free since 2017 (CRTC ruling) — count 1 to 5 business days.
Beware of paid "unlock my iPhone" services (DoctorSIM, OfficialiPhoneUnlock, Direct Unlocks): at $35-90, they claim to unlock via IMEI in 24h. On recent iPhones (XS and later), this is technically the same official process your carrier would perform for free, but with a middleman taking a commission. Risks: original invoice provided that doesn't match, parallel iCloud lock discovered after payment, or plain scam. Always prefer the official carrier route, even if it takes longer. If you are truly stuck — for example, a used iPhone without proof of purchase whose original carrier refuses to answer — consider a phone change instead, or our article on alternatives when the phone is not compatible.
What to do if you land at Narita with an unlockable locked phone
The worst-case scenario: you land at Narita or Haneda, you try to activate your PlanJapan eSIM, and "Activation failed — carrier not authorized" pops up. Don't panic — several solutions exist on the spot. Solution 1 — Pocket WiFi: rent a portable WiFi router at the airport (Narita Terminal 1, Sakura Mobile, NinjaWiFi, Japan Wireless counters) for ¥800-1500/day. Pro: no phone constraint, works with any WiFi device. Con: 200g extra to carry, separate battery to recharge, shared throughput. Solution 2 — Physical SIM card: if your phone is Verizon-locked but has a nano-SIM slot (non-US iPhone or Android), you can sometimes insert a Japanese PostPay SIM (Sakura Mobile, Mobal, Japan Wireless data SIM) — the SIM lock sometimes only applies to eSIMs on certain models. To test on the spot before purchase.
Solution 3 — Remote unlock during the trip: if you have your original carrier's number and your IMEI, you can launch the unlock from Tokyo via WhatsApp or the web portal (Verizon, AT&T, T-Mobile all accept online requests without a call). The code arrives by email within 1 to 5 days. Meanwhile, use the free WiFi at hotels, Starbucks, Family Mart and 7-Eleven (network "7SPOT") or JR Pass WiFi. Our guide Free WiFi in Japan details the best networks available in each major city and the pitfalls (30-minute session limits, captive portal in Japanese, etc.).
Solution 4 — Buy an emergency phone: Bic Camera and Yodobashi Camera sell "SIM Free" smartphones starting at ¥8000 (Xiaomi Redmi 12, OPPO A18) — functional, compatible with PlanJapan eSIM, and usable as a secondary phone or hotspot. You can then install the PlanJapan eSIM on this new device and use your locked iPhone in WiFi mode via tethering. The most radical solution, but 100% reliable, and the phone remains useful on return as a loaner or for a future trip. Avoid Akihabara for emergency phones: tourist pricing, limited warranty — prefer Bic Camera Yurakucho or Yodobashi Akiba for transparency and English in store.
Japan trip: the 5-minute check before departure that saves everything
To avoid any bad surprise on arrival, run the full test at home before departure — it is the step skipped by 80% of travellers who later run into eSIM trouble. Test 1, lock status: Settings > General > About > Carrier Lock on iPhone, or *#06# + a call to your carrier on Android. Write down the exact result. Test 2, PlanJapan eSIM installation: receive your QR code by email, scan it right now via Settings > Cellular > Add eSIM > Scan QR code. The profile should install without error (label "Japan" or similar). If an error appears here, you know immediately there is a problem — fix it before departure, not after.
Test 3, dual SIM active: your PlanJapan eSIM must be able to coexist with your home line (Verizon, T-Mobile, EE, etc.). Check Settings > Cellular > you should see both lines listed. For now, leave your home line as "Cellular Data Default" — you will switch to PlanJapan on arrival at Narita. Our guide Japan eSIM in dual SIM mode details the optimal setup to keep your home number reachable while using NTT Docomo data. Test 4 (Android only): Settings > Connections > SIM Manager > check that both lines appear and that you can toggle data between them.
Test 5, plan B ready: have on hand your phone's IMEI (Settings > General > About > IMEI or *#06#), your original carrier's customer service number (Verizon +1-800-922-0204, AT&T +1-611, EE +44-150-933-3500), your My Verizon/My AT&T/My EE login accessible from in-flight or airport WiFi, and a validated international payment card to rent a Pocket WiFi as a last resort. Five minutes of home preparation turns a potential nightmare into a simple formality. And if everything works on test 2, you arrive at Narita perfectly relaxed: activating your eSIM at Narita or Haneda will take just 90 seconds.
FAQ — Locked phone and Japan eSIM
Is my iPhone bought in France from Orange in 2020 locked for travel to Japan?
No. Since 1 January 2018, all iPhones sold in France by Orange, SFR, Bouygues and Free are either shipped unlocked or must be unlocked free of charge on request in the days following the purchase. Still, check for peace of mind: Settings > General > About > Carrier Lock must show "No SIM restrictions". Your PlanJapan eSIM on NTT Docomo will install without issue.
I bought my iPhone at Apple Store in the United States. Am I locked?
If you paid cash or one-time at a US Apple Store, your iPhone ships unlocked ("factory unlocked"). If you chose monthly Apple Card financing, the iPhone is also technically unlocked but stays tied to your Apple Card account. If you bought it from Verizon, AT&T or T-Mobile (corporate corners or web), it is locked until 60 days of active use, then automatic unlock.
Is my Pixel from Google Fi locked for Japan?
No. Google Fi sells its Pixels unlocked, like Apple Store. It is one of the rare US carriers that does not lock. Your Pixel 8 or 9 will accept the PlanJapan eSIM with no prior procedure and will run on NTT Docomo and SoftBank networks as soon as you land at Narita. Still check via Settings > About phone > SIM card status.
How long does a Verizon unlock take before a Japan trip?
For an eligible phone (60 days of active use on a Verizon Postpaid account), the unlock is automatic and instant, with no request to file. For Verizon Prepaid after 60 days, count 24 to 48h. Start the process 10 to 14 days before departure to absorb weekends and any administrative delay. Keep the confirmation SMS as proof.
My phone is locked and I leave in 3 days. What do I do?
Three options: rent a Pocket WiFi at Narita or Haneda (¥800-1500/day, keeps a shared connection with your phone over WiFi), buy an emergency smartphone at Bic Camera or Yodobashi for ¥8000-15000 and install your PlanJapan eSIM on it, or rely on the free WiFi at hotels and Family Mart while the carrier processes the unlock. Avoid paid unlock services in a rush: high scam risk.
Can a Japanese Docomo or SoftBank iPhone accept a PlanJapan eSIM?
As long as the phone is locked, no. An iPhone sold by Docomo or SoftBank is carrier locked until full payment plus an explicit unlock request at a store, with your Zairyu (Japanese residence) card. For a traveller, those Japanese iPhones should be avoided unless purchased as "SIM Free" directly at Apple Store Japan or Bic Camera (model marked SIM フリー).
Is the phone unlock permanent or just for the Japan trip?
The unlock is permanent and worldwide. Once your iPhone or Android has been unlocked by your carrier (Verizon, AT&T, EE, Orange, etc.), it will accept any SIM or eSIM from any carrier, anywhere in the world. You can reuse this unlock for PlanJapan but also for a future trip to Thailand, Spain, the US, etc. — it is a permanent software status change.