I just found out a way to log in ( for those who cant log in)
Im always getting stucked at the loading section right after opening the game. I get looped from black screen to the loading screen infinitely. If you experience the same problem like me, try spamming your back key (lower right button of phone) until the percentage of loading appears.
Please let other guys know. I know how bad it feels not to play this awesome game.
I hope it can help others