I recently started playing the game on an Android phone. but now the game is vertical, previously I played this horizontally on iphone. Is there a way to do that on an Android phone?
As Jose says. On the app it has never been possible to use it horizontally on phone.
However it should be possible to use the menus in the horizontal layout if you access the game through your phones web browser instead of the app. But this will be for the menus only, not the races.