How to differentiate between iphone4 and iphone 3

Question

I am trying to build a game for the iphone using cocos2d engine. I wanted to know how can I tell a difference whether the user is using iphone 4 or iphone 3 as I wanted to l

Answer 1

just adding my 2 cents :

I see what you are doing here, but binding this to a specific value like 2.0 is good for the moment, but what if for example next iPad got resolution bump like x1.5 ? For me anything that goes above 1.0 is kind of higher-than-normal display so I will load hi-res graphics. Does not matter much then if that is iPad,iPhone ....