Verification Text Not Arriving in Japan? Fix It in the Right Order

2026年9月10日

Verification Text Not Arriving in Japan? Fix It in the Right Order

The fastest fix is to confirm the registered phone number, make sure that SIM line is active, and check both phone-level and carrier-level SMS filters before requesting another code. Repeatedly tapping “resend” can create several codes, trigger a request limit, or leave you entering an older code that is no longer valid.

This guide is for new residents, students, workers, and other people using SMS verification for banking, payments, shopping, delivery, mobile service, or online accounts in Japan.

Quick checklist

Confirm the service has your current SMS-capable mobile number.
Check that the correct SIM or eSIM line is turned on.
Test whether you can receive an ordinary SMS.
Look in spam, blocked, and unknown-sender folders.
Review your carrier’s international and bulk-SMS filters.
Wait a few minutes, then request one new code.
If other texts arrive but this code does not, contact the service first.

TOC

First identify where the failure is happening

One simple test separates a phone or carrier problem from a problem with one account. Ask someone to send an ordinary SMS to the same number, or use another legitimate service that can send a test message.

There are three broad cases:

No SMS messages arrive: Check the active SIM, signal, account status, device settings, storage, and carrier restrictions.
Ordinary SMS arrives, but one service’s code does not: The registered number, the sender’s delivery system, a sender-specific block, or a request limit is the more likely cause.
The code arrives late: Use only the newest code. Earlier codes may expire or become invalid after a new request.

This distinction matters when asking for help. A mobile carrier can investigate whether its network delivered or blocked an SMS, but it cannot correct the phone number stored by a bank or shopping service. The service sending the code controls that account information.

Step 1: Check the number registered with the service

A correct-looking number can still be wrong because Japanese domestic and international formats are different.

Japanese mobile numbers normally begin with 070, 080, or 090 and contain 11 digits. A typical domestic entry looks like:

09012345678

If a form already displays Japan’s country code, +81, it will often expect the first zero to be removed:

+81 90 1234 5678

Do not automatically add +81 or remove the zero. Follow the example printed beside that particular field. A Japanese service designed only for domestic numbers may expect all 11 digits beginning with zero.

Also check for these common account problems:

The number belongs to an old SIM that was cancelled.
You changed carriers and kept the number through MNP (mobile number portability) very recently.
The account still contains a temporary or overseas number used before moving.
A family member’s or employer’s number was registered.
The number was entered with an extra digit, missing digit, or wrong country code.

Some services do not accept VoIP numbers, data-only SIMs, or foreign numbers. A phone number that works for calls in an app is not necessarily an SMS-capable mobile number.

If the number cannot be edited without a code

Do not create a second account unless the service tells you to. That can produce duplicate customer records and make identity checks harder.

Instead, find the service’s official recovery route. It may ask for an alternative authentication method, account details, or identity documents. Requirements differ by operator and by regulated service, especially for banks and payment accounts.

Step 2: Make sure the correct SIM can receive SMS

On a dual-SIM phone, the number receiving the code must belong to a line that is installed, enabled, and connected to a mobile network. The line used for mobile data is not always the line registered with the account.

Check the following:

Open the phone’s SIM or mobile-network settings.
Confirm that the required physical SIM or eSIM is turned on.
Check that the expected carrier name and signal bars appear.
Turn airplane mode on briefly, then turn it off.
Restart the phone.
Test an ordinary SMS again.

Wi-Fi alone does not prove that the mobile line is connected. You may have internet access while the SIM needed for the verification text has no service.

Apple’s Dual SIM guidance says each line can be turned on separately under Cellular settings. Menu names vary by iPhone language and software version. On Android, the path differs by manufacturer, but it is usually under Network, Connections, Mobile Network, or SIM Manager.

Data-only and travel eSIMs

Many travel eSIMs provide mobile data but no Japanese telephone number. They cannot receive an SMS sent to a Japanese mobile number.

If you kept your home-country SIM for verification and added a Japanese data eSIM, the code must still reach the home-country line. That line needs to support roaming and incoming SMS in Japan. Charges and availability depend on the overseas carrier, so check that carrier’s official roaming terms.

Step 3: Check the message app and device filters

The code may already be on the phone but outside the main inbox or hidden by notification settings.

Search the message app for the service name and inspect:

Spam or junk folders
Blocked messages
Unknown senders
Archived conversations
Recently deleted messages
Notification summaries or muted conversations

Verification texts do not always display the familiar company name. The sender may appear as a telephone number, an alphanumeric label, or a delivery provider.

Do not unblock every suspicious sender permanently. Temporarily review the relevant settings, request one code, and restore your preferred protection afterward. A real verification code should be entered only on the official app or website where you started the request.

Storage and software checks

NTT DOCOMO lists insufficient device storage, poor signal, an SMS-incompatible device, incorrect input, congestion, and service maintenance among possible reasons a code may not arrive. If the phone is almost full, free some space and restart it.

Also install pending operating-system and carrier-setting updates when practical. Avoid resetting network settings as a first step because doing so may remove saved Wi-Fi and network configuration without fixing a sender-specific failure.

Step 4: Review carrier-level SMS blocking

A phone can show no blocked message because the carrier may reject it before delivery. This is particularly important when a verification provider routes messages through an overseas network.

Japanese carriers offer controls with names such as:

SMS kyohi settei (SMS拒否設定): SMS rejection settings
Kokusai SMS kyohi (国際SMS拒否): international SMS blocking
Kaigai denwa bangō mail no kyohi (海外電話番号メールの拒否): rejection of messages from overseas phone numbers
Meiwaku SMS block (迷惑SMSブロック): junk or spam SMS blocking

NTT DOCOMO allows customers to block categories including international SMS, messages from other domestic carriers, undisclosed senders, and specified numbers. SoftBank likewise provides controls for all SMS, listed senders, URL-containing messages, spoofed senders, and messages from overseas numbers.

The settings and default values are not identical across DOCOMO, au, SoftBank, Rakuten Mobile, and MVNO services. Open your carrier’s official account page or support app and check the current settings for your own plan.

ここがポイント: If normal texts arrive but codes from several unrelated services do not, check international, spam, and sender-category filters at the carrier level—not only the blocked list inside the phone.

Do not disable security protection blindly

Spam filtering protects against phishing. Before changing it:

Confirm that you initiated the verification request.
Use the carrier’s official app or website, not a link in an unexpected message.
Change only the setting likely to affect the expected sender.
Restore the original protection after testing if a broad exception was required.

If the carrier’s automatic junk-SMS system discarded a message, it may not be recoverable from the handset. Request a fresh code only after the relevant setting has been checked.

Step 5: Stop resending and allow the newest code to arrive

After the basic checks, wait and make one controlled attempt. Mobile congestion, maintenance, and communication between the sender and carriers can delay delivery.

Use this sequence:

Stop requesting codes for several minutes.
Close and reopen the official app or page.
Confirm the displayed destination number.
Request one new code.
Keep the screen open and wait for the stated validity period.
Enter only the latest code received.

Google notes that recovery-code requests can be limited and advises waiting 24 hours after exceeding its daily limit. It also warns that messaging may not work immediately after a number is ported to another carrier. These are service-specific examples, not universal waiting periods; follow the message shown by the service you are using.

If several delayed texts arrive together, discard the older ones. Never send a verification code to a person claiming to be support staff.

Special cases that need a different response

Some failures cannot be solved by changing the phone’s inbox settings.

You recently used MNP or replaced a SIM

After mobile number portability, a SIM replacement, or an eSIM transfer, confirm that ordinary calls and SMS work on the new line. If they do not, contact the new carrier.

If ordinary SMS works but verification messages do not, contact the sending service and explain that the number was recently ported. Its delivery provider may still have outdated routing information.

You are outside Japan

Receiving an SMS abroad depends on the Japanese plan, roaming status, visited network, handset, and any call or message barring. DOCOMO warns that some roaming call-barring settings can prevent SMS reception. SoftBank also documents restrictions that can affect incoming communications while overseas.

Check:

International roaming is available for the line.
The line has connected to a supported local network.
Incoming communications are not barred.
The Japanese SIM remains active.
The service permits verification while abroad.

Receiving an SMS is often treated differently from using mobile data or answering a voice call, but fees and conditions vary. Confirm them with your carrier before travelling.

The service accepts only a Japanese number

A foreign SIM roaming in Japan may receive ordinary texts but still be rejected by a Japanese service during registration. This is an account-eligibility rule, not an SMS fault.

Read the field instructions and terms. If a Japanese number is required, use an eligible voice-and-SMS plan registered to you. Do not use a public “receive SMS online” number for banking, payment, government, medical, work, or other sensitive accounts.

The account offers another verification method

Look for options such as:

“Try another way”
“Didn’t get a code?”
Voice call
Email
Authenticator app
Passkey
Approval on a trusted device
Backup code

For example, Apple can display a verification code on a trusted device or send it by text or phone call. Google documents an Android security-code method that can generate a code on the device without mobile service or an internet connection. Availability depends on the account and whether the method was set up earlier.

Who should you contact?

Contact the party that controls the failing part of the process. This saves time and produces a clearer support request.

Contact the mobile carrier when

No SMS messages arrive from any sender.
The SIM shows no service or cannot make ordinary calls.
You suspect international, bulk, shortcode, or spam filtering.
The problem began after MNP, SIM replacement, or eSIM activation.
You are roaming and need to confirm SMS support.

Ask whether the line can receive ordinary SMS and whether any network-level rejection setting applies. Carrier support may use the Japanese phrase SMS ga todokanai (SMSが届かない), meaning “SMS does not arrive.”

Contact the service sending the code when

Other SMS messages arrive normally.
The account shows the wrong or masked number.
Only one company’s codes fail.
The page reports too many attempts or a locked account.
You need to replace an inaccessible registered number.

Give support the approximate request time, country, carrier, masked destination number, and exact error message. Do not send your password or verification code.

Common mistakes to avoid

The wrong troubleshooting step can make account recovery slower or weaken security.

Requesting codes repeatedly: This can invalidate earlier codes or trigger a limit.
Checking only notifications: Open the message app and inspect filtered folders directly.
Assuming the data SIM receives the code: Verification follows the registered telephone number.
Removing the leading zero without checking the form: Domestic and international formats differ.
Turning off every spam safeguard: Change the smallest relevant setting and restore protection afterward.
Sharing the code with “support”: Legitimate staff should not ask you to disclose a one-time code.
Using an online shared number: Another person may see the code or later control the account.
Creating duplicate accounts immediately: Recovery and identity verification can become more complicated.

A practical order that works in most cases

Start with the checks that are quick, safe, and easy to reverse.

Verify the masked destination and number format.
Confirm the correct SIM or eSIM is active and has signal.
Receive a normal test SMS.
Search spam, blocked, and unknown-sender folders.
Review the carrier’s SMS rejection settings.
Wait, then request one fresh code.
Try an official alternative verification method.
Contact the carrier if SMS generally fails; contact the service if only its code fails.

Before relying on SMS for an important deadline, add a second recovery method where the account permits it. An authenticator, passkey, trusted device, backup code, or secondary trusted number can prevent a lost SIM or delayed text from becoming an account lockout.

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