My single-view application for iPhone only works fine, with no errors. The contents of my view controllers fit on my real iPhone 6 device and all of the simulators besides the iPhone 4s and iPhone 5. No amount of embedding and constraining has helped, and I am confused about the option of creating new .xib files for just the iPhone 4s and 5. I am in the process of creating screenshots and then submitting my app when the App Store reopens for submissions after the holiday break. This is a very important step! Thanks in advance for any help.