Board Thread:Questions and Answers/@comment-113.10.116.141-20141115153719/@comment-24956068-20141229130908

You can keep your Line account and all games stats by registering your Line account with email address. It is an important tool to keep your account from missing by any chance and easier log in to outside phone (such as PC version or Line Store).

Open your Line Messenger application, go to Settings under "More options" tab. Tap "Account" and tap "Email Account Registration". Follow the instructions, it should not take more than 3 minutes.