I’m developing the app to work both on iphone4 and iPhone 5. I’m using the following code to get the screen size
CGRect screenBounds = [[UIScreen mainScreen] bounds];

am using the iPhone 5 simulator but it showing the screen size of iPhone 4.
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On the simulator make sure you have set to iPhone (Retina 4-inch).
You can do this by going simulator menu at the top go to Hardware>>Device>>iPhone (Retina 4-inch) that will change the phone simulator to the iPhone 5 version.
If this is set then you may need to add a launch image for the iPhone 5.
Default-568h@2x.pngif this is missing it will not launch in iPhone (Retina 4-inch).I have also answer another question here that may help.