If your phone number appears as unknown when making calls, it may be due to one of the following reasons.
• There is a restriction due to the recipient’s device or carrier
Your caller ID depends on the recipient’s device. For some device models, your name will appear as it's registered in the device's contacts list. On other devices, your phone number may appear in an international format or as an unknown number.
Also, if the mobile service provider of the person you're calling has caller ID spoofing countermeasures in place, your phone number will appear as unknown or private, even if you've verified your number to allow others to see it.
Note: To find out if a mobile service provider is implementing caller ID spoofing countermeasures, we ask that you contact them directly.
• You didn't verify your phone number
If you don’t see a phone number at the top of the screen after going to the Home tab > Settings > LINE Out, it means that your phone number hasn't been verified and will appear as unknown.
To enable caller ID, you need to verify your phone number.
You can verify your phone number by following the steps below.
Note: You won't be able to verify a phone number with a device that doesn't have a phone number (e.g. iPad, iPod touch, tablets) or if you're using a data-only SIM card that can't send or receive text messages.
1. Tap the Home tab > Settings.
2. Tap LINE Out > Verify phone number.
3. Enter your phone number > tap Verify phone number, and confirm.
4. Enter the verification code you received via text message.
Tap here to go to LINE Out Settings on your smartphone.
If you’re still unable to verify your phone number after trying the above, please contact us via the Inquiry Form.
Call quality may suffer if you use LINE Out with a weak signal or unstable network connection, so make sure to call from an area with a strong connection.
If there is no problem with your network connection and you're still experiencing issues, please try the following:
• Update to the latest version of the LINE app here.
• Restart your device.
• Make sure there are no restrictions on your internet connection speed.
Note: If your internet connection speed is restricted (e.g. because of the data limit for a flat-rate packet plan), you may not be able to use the call feature properly with 3G and 4G (LTE) connections.
If you're still having issues after trying the troubleshooting tips above, please contact us via the Inquiry Form.