I asked LINE before the end of the Lite version why LINE cannot be used with multiple smartphones

LINE Lite's Google Play page

　LINE's LINE LITE (Android) service will end on February 28. Originally, it is the same app that cannot be used in Japan, but some Japanese users lament that "honestly is troubled." With LINE Lite, you can use one account at the same time with multiple smartphones. In the first place, why can't LINE share accounts with multiple smartphones? I asked LINE. [Image] There is no information on LINE Lite in the LINE press release list, and there are iPad and Windows versions in addition to the smartphone version. These have a function called "QR code login", which allows you to share your account between multiple devices. However, because the smartphone version does not have the same function, it is not possible to share accounts between smartphones. There have been many voices that this specification is inconvenient. For example, Twitter, Facebook Messenger, Slack, Discord, etc. can be installed on multiple units without the boundaries of iOS and Android. Why can't you do this on LINE? When asked the company, it is designed to reduce the risk of unauthorized access to not sharing accounts between smartphones. This is the case when the company's first answer is summarized. In principle, the LINE account is one -on -one compatible with the phone number, and the login requires a smartphone with a phone number and LINE installed. There is almost no risk of unauthorized access unless a smartphone with another phone number can only log in to another account, unless a smartphone that has not locked a screen is stolen. In iPad and Windows, logging in requires a parent's smartphone, so you don't allow unauthorized access without knowing. However, there are strange points in the explanation. The SMS authentication itself certainly only needs to receive information on SMS, so you can receive SMS with another smartphone. Also, if you can keep the safety of your iPad or Windows login, if you attach the same QR code login function to the smartphone version, it would be possible to share your account between your smartphone. I asked LINE with additional this. "You can use the same account in the PC version and the iPad version, but you can not use the same account from multiple devices in the smartphone version. Only one application authentication is possible per phone number. With the same phone number. If the authentication was performed on another terminal, the account was automatically deleted in the previous terminals (LINE), but no more information was obtained. Regarding the fact that LINE Lite can share accounts between smartphones, we do not recommend using LINE Lite to use LINE Lite to use LINE Lite to use LINE Lite. ) It was. Certainly, there is something that needs to be considered in terms of security if the smartphone version has a mechanism like a QR code login. For example, (1) the attacker uses the owner's smartphone in some way, logs in from the attacker's smartphone, (2) Change the phone number from the setting screen, and (3) Log out from the original smartphone-. There seems to be a problem that can be taken over. This method does not work because the phone number cannot be changed in the iPad version or Windows version. However, if the smartphone version is the same, the account may not be able to be transferred when the phone number is changed. On the other hand, if you share your account with a QR code login in LINE Lite, the phone number cannot be changed. It would be nice if LINE would take information security measures and officially provide an app like LINE Lite, but that's not the case. Regarding LINE LITE, LINE said, "LINE Lite has a different LINE body and development department, so you have to ask detailed specifications." On the day of the announcement of the end of LINE Lite's service, he contacted LINE, but he didn't even know the end of the service. In the future, there is a possibility that LINE's Chrome extended version and smartphone browser for smartphones that can use CHROME extensions for PC may be tricky, but it is hoped to share accounts with multiple smartphones.

ITMEDIA NEWS