Some Android users are having problems to login with Line. It might happen even when you are an old user of Line. Or after having registered into Line a few minutes, hours or even days ago.
There is a solution to this.
Do not type your username or email for the one hundreth time. But tap the «new users» button and (after being asked for your phone number) you will immediately be logged into Line again.
Hopes this helped you! At least it worked with a friend of mine’s Android 🙂
yobrainstorming 