Line registration is not limited to mobile phone numbers. Although mobile phone number is a common way to register, it is not the only choice. In some cases, if there are only mobile phone numbers in mainland China, you may not be able to use the mobile phone number for line registration, because Line does not support mobile phone numbers in mainland China. At this time, you can try to register using the virtual number of the access platform. In addition, although Line does not support the use of email for registration, there has been a way to use a third-party account (such as Facebook) for Line registration before. However, it should be noted that LINE has banned the use of Facebook account to apply for LINE account in 2020.
Please note that the verification code may not be received during the registration process, which may be related to network conditions. In case of such problems, it is recommended to check the network connection and try to send the verification code again.
To sum up, although mobile phone number is a common method of Line registration, it is not the only choice. You can choose the appropriate registration method according to the actual situation. At the same time, during the registration process, ensure that the network connection is stable, so as to receive the verification code smoothly.