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Call Issues

Number displayed as unknown toggle
Your number may display as Unknown when you call your friend using LINE Out for the following reasons.

1. Restrictions may be in place on the recipient’s device
If the caller is using NTT docomo or Softbank, the call will appear as Unknown or Private on the recipient's device.
Caller ID functions differently depending on the recipient’s device. Some devices can display the caller’s name as it is saved in the device’s contacts, while others may display the number in international format or as Unknown.

2. You did not verify your phone number
If you do not see a phone number at the top of the page when you go to Call > Settings, you have not verified your phone number. In this case, your number will be displayed as Unknown when you make calls.

Please see the following article about how to verify your phone number.


3. You are using a data-only SIM card that cannot receive SMS messages, or an iPad, iPod touch, or tablet
You need to verify your phone number in order to use LINE Out. Devices that do not have phone numbers, such as iPads, iPod touch devices, and tablets, cannot be used with LINE Out. Data-only SIM cards that cannot receive SMS messages cannot be used to verify your phone number by SMS, so LINE Out also cannot be used with them.

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Verifying your phone number to enable Caller ID toggle
To verify your phone number to enable caller ID, please refer to the steps below.

Phone number verification is not available on devices without phone numbers such as iPads, iPod touch devices, tablets, and data-only SIM cards that cannot receive SMS messages.

Steps to Verify Your Phone Number
1. Tap the Call tab.
2. Tap the keypad icon at the top of the screen.
3. Tap the settings icon at the bottom of the screen.
4. Tap Anonymous Call.
5. Tap OK on the pop-up.
6. Complete the verification procedure.
Some Android devices automatically enter the verification code received by SMS.


If you are unable to verify your phone number, please contact us using the Problem Report Form.

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Low call quality toggle
If you use LINE Out in a place with a weak signal or an unstable network connection, your call quality may deteriorate. Please use LINE Out in places with a strong signal.

If you are still experiencing issues with call quality even though you are in a place with a strong signal, please try the following steps.

1. Update your LINE app from the URL below.
http://line.me/update
2. Restart your device.
3. Check if any speed restrictions have been placed on your phone line for exceeding the data usage limit of your plan. If your connection speed is restricted, you may not be able to make calls on a 3G or 4G LTE connection.

If the problem remains after trying the steps above, please contact us using the Problem Report Form.

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I can't use LINE Out (first time user) toggle
When you use LINE Out for the first time, the initial use screen will be displayed, so please tap Start at the bottom of the screen.

This screen will not appear again after the first time.

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