I am looking to purchase one of these and I wanted to know, do either of these or both of these work on an iPhone the same way as desktop?
Not in exactly the same way butt you can navigate from the text to the apparatus by tapping the link in the text
This is on my iPad but it would be similar on iPhone thought the smaller screensize could make it difficult to use effectively
Is this NA or UBS?
The screenshot above was NA, this is UBS5
Is there anything that links the church fathers to their quotes?
On the mobiles, no.
On the desktop, if you're lucky, you can hook a Cited By panel to a Church Fathers series, that periodically footnotes which passage is being used. But it's very arguable.
You might also look at Graham's screen copies for apparatus. NA28 has active-popups to identify more about the mss number ... library and more importantly, century and dependence. UBS5 doesn't, other than to narrow down coptic, etc. So, with UBS, you need to know your mss's.
What do you mean and/or how do you execute : "On the desktop, if you're lucky, you can hook a Cited By panel to a Church Fathers series, that periodically footnotes which passage is being used. But it's very arguable."