javascript/widgets/handler/phonesigninfinish.js
function() {
        component.dispose();
        // Render previous phone sign in start page.
        firebaseui.auth.widget.handler.handle(
            firebaseui.auth.widget.HandlerName.PHONE_SIGN_IN_START, app,
            container, phoneNumberValue);
      }
function() {
        component.dispose();
        // Render previous phone sign in start page.
        firebaseui.auth.widget.handler.handle(
            firebaseui.auth.widget.HandlerName.PHONE_SIGN_IN_START, app,
            container, phoneNumberValue);
      }
function ( ) { component . dispose ( ) ; // Render previous phone sign in start page. firebaseui . auth . widget . handler . handle ( firebaseui . auth . widget . HandlerName . PHONE_SIGN_IN_START , app , container , phoneNumberValue ) ; }
On change phone number click.
On change phone number click .