If you synced LINE with your device’s contacts, your friend list on LINE will use the names registered in your device.
Note: When you open a friend's profile pop-up on LINE, the display name that they set will appear in a smaller font under their name from your contacts.
For this reason, if a phone number registered in your device's contacts was canceled or entered incorrectly, the LINE account belonging to the current owner of that phone number will appear under your friend's name in your friend list.
Please contact your friend via a method other than LINE to confirm their phone number if you are having any of the following issues.
Issues occurring on your device:
• A different account appears in your friend list under your own name
Check whether an old phone number is registered under your name in your device's contacts.
• Someone who doesn't use LINE appears in your friend list
Make sure the person's phone number is correct and current in your device's contacts list.
• The name of someone in your friend list suddenly changes
Check whether you changed their registered name in your device's contacts list.
• You meant to chat with a friend registered in your device's contacts list, but it was actually someone else
Check whether you've registered multiple phone numbers for your friend in your device's contacts.
Issues occurring on other people's devices:
• Your friend sees you on LINE even though you don't use the service
Check whether your old phone number or other information is registered in the contacts on your friend's device.
• Someone you don't know sees you on their LINE account when you register a newly contracted phone number
The previous owner of the phone number may be registered in the contacts of the device belonging to the unknown user.
• Your friend sees duplicates of your account on their LINE account
Check whether your old phone number or other information is registered under your name in the contacts on your friend's device.
If unknown users already appear in your friend list, please delete them after hiding or blocking them. For more information on removing friends, see this Help article
If you're still having an issue after you've confirmed everything above, your device information may not be synced with the information on LINE's servers. For more information, see this Help article
Let us know if we can make it better.