Developing same UI for 3.5, 4.0 (updated 4.7 and 5.5) inches screens in Xcode 5.0.1 (updated xcode 6), no landscape, no iPad and no storyboard

1. I have developed app considering 3.5 inch with .xib files and not storyboard.
2. I am unable to find any tutorial or guide which will help me in designing app similar for all screens.
3. I am using Xcode 5.0.1
4. I am developing only plain app with no auto layout and only for iOS 6 and iOS 7 (IPhone).

5. Below is the screenshot how it differs on different screens.

   A. IPhone iOS 6 simulator:

   B. 3.5 Inch (Ios 6 and Ios 7) C. 4.0 Inch (Ios 6 and Ios 7)

Update: Please update below answers to also know 4.7 and 5.5 inches screen.