Samsung Galaxy S II , is the only competitive cellphone to Apple's iPhone. It is Android based and has a bigger screen then iPhone 4S. Also Galaxy S II has a 8 Mega pixel camera but is not as good as iPhone 4S Camera. 4S has used Hi-Tech optics which fed in more light to the camera for better picture quality. There is still a long way for cellphone manufacturing companies to compete with Apple who still rules the market with their innovative iPhone.