When you send an inquiry via the Inquiry Form, the Service Messages official account sends you a notification from LINE Customer Care to let you know that it was received.
Note: You'll get a notification if you send an inquiry from within LINE or a related service app, or if you send an inquiry while logged in to your LINE account.
Notifications are sent via chat message when your inquiry is received and when LINE Customer Care sends you a reply. To check your inquiries and replies, access My Inquiries in the notification message you received.
Note: The Service Messages official account cannot be blocked, and there is no way to stop receiving messages from it.
The error message "Unable to use account" suddenly appeared
The "Unable to use account" error message usually appears for one of the following reasons.
Your LINE account has become inaccessible because the registered phone number was removed
Note: Once your account becomes inaccessible, the data related to it (including your friends and chat history) is deleted and cannot be restored.
If a new account was created with the phone number that was registered to the LINE account you were using:
The same phone number being registered to more than one LINE account is causing the issue.
Note: With the smartphone version of LINE, the same account cannot be used on multiple devices.
Only one phone number or email address can be used to verify one account per device. If you verify your LINE account with the same phone number on a different device, the account on your previous device will automatically be deleted and you will no longer be able to use it.
Please keep using the account you can currently use, or create a new one.
If a phone number you canceled was still registered to your LINE account:
Your account may have become inaccessible because someone else began using your canceled phone number and registered it to their LINE account.
Note: Rest assured that the person currently contracted with your old phone number cannot access your previous LINE account data, and your account has not been stolen.
In this case, you will need to sign up for a new account with a phone number you're currently contracted with.
Your LINE account was transferred to a different device
Transferring your account to a different device (e.g. smartphone, tablet) will make it inaccessible on the previous device.
If you want to use your LINE account on the previous device again, tap OK or Delete on the "Unable to use account" error message screen > Log in and transfer your account.
Note: You can use the same account on LINE for PC or LINE for iPad by logging in with the same email address.
You shared your verification code, phone number, password, or account transfer code with someone
Someone else may have used the information they learned from you to access and use your LINE account without your permission.
Please contact us via this Inquiry Form and we will check your account information.
Note: For more details, see this Help article.
If none of the cases above apply to your situation, contact us via this Inquiry Form and we will look into the matter.