LINE Verification Code Not Arriving: What to Do

A missing LINE verification code has its own entry in the LINE Help Center: "I can't verify my phone number/I don't receive the verification code text message". Start with that entry. If it does not solve the problem, LINE's next step is its Inquiry Form. Register with a number you control long term, because LINE's terms treat the code sent to that number as proof that you are the account holder.

Why does the phone number matter so much on LINE?

LINE's Terms of Use tie authentication to your mobile number. Authentication may be "based on a comparison of the code uniquely assigned for each mobile phone number sent from a mobile operator and the registered information." When that check passes, LINE says "we will provide the Services by deeming that such operation is an act by the actual User." Whoever completes the check with your registered number is treated as you.

The same terms set four rules that shape which number you should use:

• Accurate, current details. You "are obligated to (1) register true and accurate information, and (2) make appropriate corrections by yourself to keep that registered information up to date." A number you no longer hold is out-of-date registration.
• Your credentials, your responsibility. "A User must strictly manage such authentication information under its own responsibility so that it will not be abused."
• Several accounts share consequences. "If you have registered multiple accounts, measures may be taken on all of those accounts."
• No account transfers. Prohibited conduct includes the "act of acquiring accounts or passwords from others or disclosing or providing accounts or passwords to others, irrespective of the means thereof."

The consequence is practical. If you register with a number you later lose, LINE may still send future codes to that number, and you will not be there to read them.

What can you check yourself before contacting LINE?

The terms put the hardware and connection on you: users supply devices, operating systems and "communication methods" needed for the service "at their own responsibility and expense." The checks below are general checks you control. They are not LINE's published steps.

1. The number as typed. Confirm the country code and every digit on the verification screen. One wrong digit sends the code to a stranger.
2. Signal on the right line. The phone that holds the number needs mobile signal on that line. On a dual-SIM phone, check that SMS is enabled for the line you registered.
3. The SMS inbox and its filters. Look in spam, junk, unknown-sender and blocked-sender folders. Some phones and carriers filter short-code texts.
4. The line itself. Make sure the number is active and can receive texts from other senders.
5. One request at a time. Ask for a new code only from inside LINE, and give the first one a chance to arrive before you ask again.

For carrier-side causes that apply to any app, the not receiving verification codes guide covers them in more depth.

What should you do with a LINE code you did not request?

Do not share an unrequested LINE code with anyone, including a person who messages you asking for it. Under LINE's terms, using your registered authentication counts as an act by you. You are also required to manage that information "so that it will not be abused." If unrequested codes keep arriving, report it through the Inquiry Form described below.

How do you contact LINE when the code still fails?

The LINE Help Center gives the route directly: "Still can't solve your problem? Contact us via the Inquiry Form." Open the missing-code FAQ first. If you are still stuck after reading it, file an inquiry.

The Terms of Use confirm that contact goes through LINE's own channels: "please do so according to the method designated by us, such as by using the inquiry form provided by us or by e-mail to the e-mail address specified by us." The terms also note that "Users in the European Union may make inquiries and make reports on posted contents from the following form."

Watch two places for the answer. "As a general rule, we will respond to inquiries from Users only by using the message function or by e-mail." If LINE has limited or blocked verification on your number, the Inquiry Form is also the route for that.

Which kind of number should you register LINE with?

Before you register a new LINE account, ask one question: will you still hold this number the next time LINE sends a code? LINE ties identity to the registered number, so a number you keep matters more than a number that is quick to get.

Every VoidMob SMS number is a non-VoIP carrier number. Here is how the three tiers compare for a LINE account:

The one-time OTP is refunded automatically if no SMS arrives in the 15-minute window. Services marked non-refundable are the exception. Once a code has been delivered, the rental cannot be refunded. LINE codes start at $0.15 (as of November 2026).

A rental keeps the same number for the term. An expired rental can be re-rented on the same number while that number is still held.

For an account you plan to keep, the dedicated monthly line is the closest match to "a number you control long term." The US line is $19.99 a month (as of November 2026), and you can browse dedicated numbers by country.

For the longer version of that trade-off, read dedicated non-VoIP numbers versus one-time OTPs. The WhatsApp Business non-VoIP number guide walks through the same keep-the-number decision for another messaging app.