LINE system can lock out users who send abusive messages. The mechanism is similar to any user locks out other user one by one, but applied to *ALL* users in this case: people can send you messages but your messages would *NEVER* reach them.
The banned objects should include the specified phone number, as well as phone hardware serials such as IMEI. Therefore old number, phone, as well as ID and email of the spammer may all encounter access failure for new registration.
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