If the phone number you have registered to LINE isn't the same as your current phone number, you may suddenly become unable to use LINE.
E.g.
You register phone number A to LINE, but then cancel or change it.
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You continue using LINE with the canceled phone number A still registered to it.
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A certain amount of time passes, and someone else makes a new contract with phone number A.
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The person newly contracted with phone number A registers it to LINE.
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Phone number A is removed from your LINE account, which then becomes inaccessible.
Once a certain amount of time passes after canceling your phone number, it can be contracted to and used by someone else.
Let us know if we can make it better.
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