There has been an increase in cases of unauthorized logins that were likely due to the use of easy-to-guess passwords. We strongly recommend changing the password you've set on LINE if it can be easily guessed or is also being used with another service.
If the email address registered to your LINE account is with a web-based email service like Gmail or Yahoo! Mail, changing the password registered to your email account will give you even more protection.
Note: For details about changing your password with other services, contact the relevant service provider.
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