Can I run iPhone apps on iPad Mini 3 using iPhone 6 compatibility?

I have to get a device to test my apps on 64bit processors, and I am interested in iPad Mini 3. However, I would like to know, if I can run apps using iPhone compatibility to see how they would work on iPhone 6 [ and iPhone 6 plus if that's possible].

Is there any way I could do it? I can't find any info about this matter, and both iPad Mini 3 and iPhone 6 share the same ppi, so the experience should be simular [accept for the fact you hold the device differently].

I cannot do the same using simulator.