Help center

How to contact us if you're having problems with LINE

Important: Make sure your current phone number is registered to LINE

I suddenly became unable to use a feature

The error message "Unable to use account" suddenly appeared

If a screen saying "Unable to use account" suddenly appeared, please check the information for each of the three scenarios below, in order.

You haven't registered your currently contracted phone number to LINE

If the phone number you registered to LINE isn't the same as the one you are currently contracted with, you may suddenly become unable to use LINE.

Once a certain amount of time passes after canceling your phone number, it can be contracted to and used by someone else.

If the new contract holder of the phone number registers it to LINE, the LINE account it had been registered to becomes unavailable.

Checking/changing your password

Unfortunately, there is no way to directly check your registered password.

If you forgot your password, follow the steps below to change it.

Note: Be sure to write your new password down so you don’t forget it.

1. Tap the Home tab > Settings > Account.

2. Tap Password.

Note: If you're asked to unlock the screen, use the unlock method you have configured on your device, such as your passcode or biometric identification (e.g. fingerprint, face). Do not use the password registered to your LINE account.

3. Enter your new password twice, then tap Change password.

Important: Your password must contain 8-20 non-repeating half-width characters, and be a combination of at least three of the following types:

- Uppercase letters

- Lower case letters

- Numbers

- Symbols

If you're viewing this article on your smartphone, tap here to go to the Account screen.

If you don’t have access to your old device when transferring your account, see this Help article.

We recommend setting a password that is difficult for third parties to guess. For tips on setting a secure password, see this Help article.

Was this page helpful?

Using LINE for PC

Logging in to LINE on your iPad or PC using your smartphone's unlock method

See below for the steps to log in to LINE using your smartphone's unlock method.

When logging in to LINE with your smartphone's unlock method for the first time:

1. Start LINE for iPad or LINE for PC.

2. Enter the phone number registered to your LINE account and select Log in with smartphone.

3. Select Show verification code.

4. Start the smartphone version of LINE.

5. Select the Home tab > Settings > Account > Pair a new device.

6. Enter the verification code that appears on LINE for iPad or LINE for PC into your smartphone.

7. Use your smartphone's unlock method when prompted to do so.

When logging in after the first time:

1. Start LINE for iPad or LINE for PC.

2. Enter the phone number registered to your LINE account and select Log in with smartphone.

3. Start the smartphone version of LINE.

4. Use your smartphone's unlock method when prompted to do so.

"Login successful!" will appear when you're logged in. The LINE official account will also send a login notification message to you in the smartphone version of LINE.

Note: For details about the content of this notification, see this Help article.

For more information about your smartphone's unlock method, see this Help article.

For information on how to set up LINE so you can use your smartphone's unlock method for logging in, see this Help article.

Was this page helpful?

Creating a new account

Registering an email address

Transferring your LINE account

"This message can't be displayed" appears and I can't see sent/received chat messages

If you see any of the following messages after transferring your account on a smartphone, you may not be able to view past chat messages.

- "This message can't be displayed"

- "This message wasn't backed up and restored from your previous device. Unfortunately, there's no way to read it on your current device."

- "Unable to display message as it couldn't be decrypted."

The messages above appear when:

• You transfer your account to a device with the same OS (e.g. iOS to iOS) without backing up and restoring your chats.

If you back up your chats on your old device before transferring your account, you can view them on your new device. For the steps to do so, see the following Help article.

Transferring your chat history

• You transfer your account to a device with a different OS (e.g. iOS to Android).

Note: You cannot transfer your past chats.

• You receive chat messages while transferring your account.

Any such messages cannot be transferred to your new device. For more information, see the following Help article.

About Letter Sealing

If any of these messages appear and you cannot view your past chat messages, there is unfortunately no way to re-display them. In this case, please ask the other person in the chat to send you any old messages that you need.

Was this page helpful?

Unsending/deleting messages

The differences between unsending and deleting a message are as follows.

When you unsend a message:

The message will be removed from the chat for both you and the person or group you're messaging. You can unsend messages up to 24 hours after they were sent, regardless of whether they have been read or not.

Note:
- There is no way to unsend anything (e.g. text messages, photos) that has already been deleted from a chat.

- If a message was unsent, everyone will be able to see a notice saying “~ unsent a message” in the chat.

When you delete a message:

It will only be deleted from the chat on your screen and will remain visible to the person or group you're messaging.

Note:

- Deleted information cannot be recovered or unsent.

- No one will be notified when you delete a message.

See the following sections for the steps to unsend and delete a message.

Unsending messages

Tap and hold the message you want to unsend and then tap Unsend > Unsend.
Note: After you unsend a message, a notice will appear for everyone in the chat showing that you removed it.

You can unsend messages, stickers, photos, videos, voice messages, URLs, contact information, location information, and files.

Deleting messages

1. Tap and hold the message you want to delete.
2. Tap Delete > Delete > Delete.

Was this page helpful?

Recommended system specifications for LINE

Select a device below to see the recommended system specifications for LINE.

Smartphones

• iOS 15.0 or later
• Android 8.0 or later

PCs

• Windows 10 or later
• macOS Mojave 10.14 or later
• Chrome browser version 94 or later
Note: You cannot sign up for a new account with LINE for PC.

Tablets

• iPadOS 15.0 or later
• Android 12L or later (or Android 13 or later for Samsung tablets)

Smartwatches

• Apple Watch: watchOS 8 or later
• Wear OS by Google (formerly Android Wear): LINE 12.3.0 or later; Wear OS 3.0 or later; Android 8 or later
Note: You cannot sign up for a new account on smartwatches.

Although not recommended, you can use the following versions of LINE on older OSes.

Note: Some features cannot be used on older OSes.

iOS

• iOS 14.0 to 14.8.1: Up to LINE 13.5.0 or 13.5.1
• iOS 13.0 to 13.7: Up to LINE 12.4.0
• iOS 12.0 to 12.5.6: Up to LINE 11.17.0
• iOS 11.0 to 11.4.1: Up to LINE 11.12.0
Note:
- You cannot use the app with iOS 10.3.4 or earlier.
- You cannot create new accounts or transfer existing accounts with versions of LINE older than 11.13.0.
- Try updating the LINE app here as well as your OS.

Android

• Android OS 7.0 to 7.1.2: Up to LINE 12.18.0
• Android OS 6.0 to 6.0.1: Up to LINE 11.15.0
• Android OS 5.0 to 5.1.1: Up to LINE 11.5.0
Note:
- You cannot use LINE with Android OS 4.4.4 or earlier.
- Even if you're using Android OS 8.0 or later, you may not be able to install LINE from the app store offered by your device manufacturer or mobile service provider in some cases.
- You cannot create new accounts or transfer existing accounts with versions of LINE older than 11.13.0.
- Try updating the LINE app here as well as your OS.

PCs

• Windows 7, 8, and 8.1: Only LINE 6.7.4
Note: LINE cannot be used on Windows XP or Vista.
• macOS High Sierra 10.13: Only LINE 6.7.3
Note: LINE cannot be used on macOS Sierra 10.12 or earlier.

LINE is not supported on the following devices:

• iPod touch

• WALKMAN

• SmartTV BOX

• Fire OS devices such as Kindle

• PHS devices

• Simulators/emulators (virtual environments)

• Devices with a custom OS

• Chromebooks

Was this page helpful?

LINE

Help center

Search Help articles

Announcements

About two-factor authentication

Important announcements

FAQs

How to contact us if you're having problems with LINE

Important: Make sure your current phone number is registered to LINE

I suddenly became unable to use a feature

The error message "Unable to use account" suddenly appeared

Checking/changing your password

Using LINE for PC

Logging in to LINE on your iPad or PC using your smartphone's unlock method

Creating a new account

Registering an email address

Transferring your LINE account

"This message can't be displayed" appears and I can't see sent/received chat messages

Unsending/deleting messages

Recommended system specifications for LINE

About Call me instead

Category

Issues

Creating/transferring a LINE account

Managing LINE account

Purchasing/using items

Friends/Groups

Chats/Calls/Notifications

Get more out of LINE

Security/Privacy

About Business Alliances