App running on iPad while its iPhone-Only

Question

I made an iPhone App with Xcode. The devices setting is set to "iPhone". But in iTunes Connect it is rejected because it doesn't run on the iPad.

That is weird because it is an iPhone app, but when I checked it in Xcode, I can run it with the iPad simulator,however I think that normally this is not possible with an iPhone app.

I have added pictures to make my question clearer:

So what is gone wrong and how can I fix it?

EDIT: Picture from resolution center:

Answer 1

Thanks all, I Found the problem/solution:

In my info.plist there was an extra row called supported interface orientations(iPad) where the portrait mode was added.

I have no idea how this got added here but when I removed it, the problem was solved.

Answer 2

From the Apple iOS App Store Review Guidelines (https://developer.apple.com/app-store/review/guidelines/):

2.10 iPhone Apps must also run on iPad without modification, at iPhone resolution, and at 2X iPhone 3GS resolution

Basically, if you set an app to "Universal" it will have iPad and iPhone versions of the UI and will appear in the search results for both. If you set it to iPhone only, it will still be installable on iPads, but it doesn't appear in the search results by default. Additionally when a user does install it on an iPad it will just scale up the UI to best fit the screen. You cannot prevent your app from running on iPads.