You can enter the player's information page to bind your game account with your phone number(SMS).
By clicking your portrait at the left-most corner on the top bar in the game lobby, you can enter into the player's information page.
What's the benefit of binding my SMS?
You can get a free coins gift after you bind your SMS.
You can log in your game on any device with your phone number.
You'll not lose your account since it's bound with your phone number.