iPhone only app rejected for not running on iPad
This is not an issue with supported devices - even if the iOS app is for iPhone only, it has to run on iPhone resolution on an iPad. This is the same sizing (or very, very close) as running on a iPhone 4 simulator, based on the screenshots.
Fix the constraints for iPhone 4 and it will be approved.
I got the same issue with my app which had the Deployment Info set to iPhone. Did they attach a screenshot with their response?
The issue with mine was that the constraints weren't set up properly. On smaller screen sizes (which the 1x setting on the iPad shows) my buttons were pushed together.
Check out your build on the simulator using an iPhone 5.
I had the same issue with my app.
My application was intended for iPhone and not for iPad, but the apple review team told me this:
It would be appropriate to revise your app to ensure that it runs on iPad at iPhone resolution.
My solution:
Optimize the user interface for iPhone 4
I hope it helps.