How do you play games in full touch phones like iphone and nokia 5800 ?

hihi...i am using a touchscreen phone which is the samsung OMNIA actually.. in fact, there is not much difference between using keypad or the touchscreen to play games.. for touchscreen phones, you just need to tap on the screen to navigate around or can just move the phone towards the left or right and it will navigate according... it is more fun to play game on the touchscreen phones...and that the screen is usually much bigger too...